diff --git a/CHANGELOG.md b/CHANGELOG.md
index 32543f60d20..27890f9e169 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -34,6 +34,7 @@ Docs: https://docs.openclaw.ai
 - Control UI/Dreaming: stop Imported Insights and Memory Palace from calling optional `memory-wiki` gateway methods when the plugin is off, and refresh config before wiki reloads so the Dreaming tab stops showing misleading unknown-method failures. (#66140) Thanks @mbelinky.
 - Agents/tools: only mark streamed unknown-tool retries as counted when a streamed message actually classifies an unavailable tool, and keep incomplete streamed tool names from resetting the retry streak before the final assistant message arrives. (#66145) Thanks @dutifulbob.
 - Memory/active-memory: move recalled memory onto the hidden untrusted prompt-prefix path instead of system prompt injection, label the visible Active Memory status line fields, and include the resolved recall provider/model in gateway debug logs so trace/debug output matches what the model actually saw.
+- Memory/QMD: stop treating legacy lowercase `memory.md` as a second default root collection, so QMD recall no longer searches phantom `memory-alt-*` collections and builtin/QMD root-memory fallback stays aligned. (#66141) Thanks @mbelinky.
 
 ## 2026.4.12
 
diff --git a/extensions/memory-core/src/memory/qmd-manager.test.ts b/extensions/memory-core/src/memory/qmd-manager.test.ts
index 920b70fe1e4..2d19abe5d90 100644
--- a/extensions/memory-core/src/memory/qmd-manager.test.ts
+++ b/extensions/memory-core/src/memory/qmd-manager.test.ts
@@ -797,6 +797,8 @@ describe("QmdMemoryManager", () => {
     expect(legacyCollections.has("memory-dir-main")).toBe(true);
     expect(legacyCollections.has("memory-root")).toBe(false);
     expect(legacyCollections.has("memory-dir")).toBe(false);
+    expect(legacyCollections.has("memory-alt-main")).toBe(false);
+    expect(legacyCollections.has("memory-alt")).toBe(false);
   });
 
   it("rebinds conflicting collection name when path+pattern slot is already occupied", async () => {
@@ -876,6 +878,87 @@ describe("QmdMemoryManager", () => {
     expect(logWarnMock).toHaveBeenCalledWith(expect.stringContaining("rebinding"));
   });
 
+  it("rebinds legacy memory-alt when it still owns the root slot for MEMORY.md", async () => {
+    await fs.writeFile(path.join(workspaceDir, "MEMORY.md"), "# canonical root");
+    cfg = {
+      ...cfg,
+      memory: {
+        backend: "qmd",
+        qmd: {
+          includeDefaultMemory: true,
+          update: { interval: "0s", debounceMs: 60_000, onBoot: false },
+          paths: [],
+        },
+      },
+    } as OpenClawConfig;
+
+    const listedCollections = new Map<
+      string,
+      {
+        path: string;
+        pattern: string;
+      }
+    >([["memory-alt", { path: workspaceDir, pattern: "memory.md" }]]);
+    const removeCalls: string[] = [];
+
+    spawnMock.mockImplementation((_cmd: string, args: string[]) => {
+      if (args[0] === "collection" && args[1] === "list") {
+        const child = createMockChild({ autoClose: false });
+        emitAndClose(
+          child,
+          "stdout",
+          JSON.stringify(
+            [...listedCollections.entries()].map(([name, info]) => ({
+              name,
+              path: info.path,
+              mask: info.pattern,
+            })),
+          ),
+        );
+        return child;
+      }
+      if (args[0] === "collection" && args[1] === "remove") {
+        const child = createMockChild({ autoClose: false });
+        const name = args[2] ?? "";
+        removeCalls.push(name);
+        listedCollections.delete(name);
+        queueMicrotask(() => child.closeWith(0));
+        return child;
+      }
+      if (args[0] === "collection" && args[1] === "add") {
+        const child = createMockChild({ autoClose: false });
+        const pathArg = args[2] ?? "";
+        const name = args[args.indexOf("--name") + 1] ?? "";
+        const pattern = args[args.indexOf("--glob") + 1] ?? args[args.indexOf("--mask") + 1] ?? "";
+        const hasConflict = [...listedCollections.entries()].some(([existingName, info]) => {
+          if (existingName === name || info.path !== pathArg) {
+            return false;
+          }
+          const isRootPatternPair =
+            (info.pattern === "MEMORY.md" || info.pattern === "memory.md") &&
+            (pattern === "MEMORY.md" || pattern === "memory.md");
+          return info.pattern === pattern || isRootPatternPair;
+        });
+        if (hasConflict) {
+          emitAndClose(child, "stderr", "A collection already exists for this path and pattern", 1);
+          return child;
+        }
+        listedCollections.set(name, { path: pathArg, pattern });
+        queueMicrotask(() => child.closeWith(0));
+        return child;
+      }
+      return createMockChild();
+    });
+
+    const { manager } = await createManager({ mode: "full" });
+    await manager.close();
+
+    expect(removeCalls).toContain("memory-alt");
+    expect(listedCollections.has("memory-root-main")).toBe(true);
+    expect(listedCollections.has("memory-alt")).toBe(false);
+    expect(logWarnMock).toHaveBeenCalledWith(expect.stringContaining("rebinding"));
+  });
+
   it("warns instead of silently succeeding when add conflict metadata is unavailable", async () => {
     cfg = {
       ...cfg,
@@ -912,6 +995,48 @@ describe("QmdMemoryManager", () => {
     );
   });
 
+  it("falls back to --mask when qmd collection add rejects --glob", async () => {
+    cfg = {
+      ...cfg,
+      memory: {
+        backend: "qmd",
+        qmd: {
+          includeDefaultMemory: true,
+          update: { interval: "0s", debounceMs: 60_000, onBoot: false },
+          paths: [],
+        },
+      },
+    } as OpenClawConfig;
+
+    const addFlagCalls: string[] = [];
+    spawnMock.mockImplementation((_cmd: string, args: string[]) => {
+      if (args[0] === "collection" && args[1] === "list") {
+        const child = createMockChild({ autoClose: false });
+        emitAndClose(child, "stdout", "[]");
+        return child;
+      }
+      if (args[0] === "collection" && args[1] === "add") {
+        const child = createMockChild({ autoClose: false });
+        const flag = args.includes("--glob") ? "--glob" : args.includes("--mask") ? "--mask" : "";
+        addFlagCalls.push(flag);
+        if (flag === "--glob") {
+          emitAndClose(child, "stderr", "unknown flag: --glob", 1);
+          return child;
+        }
+        queueMicrotask(() => child.closeWith(0));
+        return child;
+      }
+      return createMockChild();
+    });
+
+    const { manager } = await createManager({ mode: "full" });
+    await manager.close();
+
+    expect(addFlagCalls).toEqual(["--glob", "--mask", "--mask"]);
+    expect(logWarnMock).toHaveBeenCalledWith(
+      expect.stringContaining("retrying with legacy compatibility flag"),
+    );
+  });
   it("migrates unscoped legacy collections from plain-text collection list output", async () => {
     cfg = {
       ...cfg,
@@ -1845,6 +1970,46 @@ describe("QmdMemoryManager", () => {
     await manager.close();
   });
 
+  it("does not query phantom memory-alt collections when MEMORY.md exists", async () => {
+    await fs.writeFile(path.join(workspaceDir, "MEMORY.md"), "# canonical root");
+    cfg = {
+      ...cfg,
+      memory: {
+        backend: "qmd",
+        qmd: {
+          includeDefaultMemory: true,
+          update: { interval: "0s", debounceMs: 60_000, onBoot: false },
+          paths: [],
+        },
+      },
+    } as OpenClawConfig;
+
+    spawnMock.mockImplementation((_cmd: string, args: string[]) => {
+      if (args[0] === "search") {
+        const child = createMockChild({ autoClose: false });
+        emitAndClose(child, "stdout", "[]");
+        return child;
+      }
+      return createMockChild();
+    });
+
+    const { manager, resolved } = await createManager();
+
+    await manager.search("test", { sessionKey: "agent:main:slack:dm:u123" });
+    const maxResults = resolved.qmd?.limits.maxResults;
+    if (!maxResults) {
+      throw new Error("qmd maxResults missing");
+    }
+    const searchCalls = spawnMock.mock.calls
+      .map((call: unknown[]) => call[1] as string[])
+      .filter((args: string[]) => args[0] === "search");
+    expect(searchCalls).toEqual([
+      ["search", "test", "--json", "-n", String(maxResults), "-c", "memory-root-main"],
+      ["search", "test", "--json", "-n", String(maxResults), "-c", "memory-dir-main"],
+    ]);
+    await manager.close();
+  });
+
   it("uses explicit external custom collection names verbatim at query time", async () => {
     const sharedMirrorDir = path.join(tmpRoot, "shared-notion-mirror");
     await fs.mkdir(sharedMirrorDir);
diff --git a/extensions/memory-core/src/memory/qmd-manager.ts b/extensions/memory-core/src/memory/qmd-manager.ts
index 47add225ff7..ee4cbca9bf4 100644
--- a/extensions/memory-core/src/memory/qmd-manager.ts
+++ b/extensions/memory-core/src/memory/qmd-manager.ts
@@ -1,4 +1,5 @@
 import crypto from "node:crypto";
+import fsSync from "node:fs";
 import fs from "node:fs/promises";
 import os from "node:os";
 import path from "node:path";
@@ -507,7 +508,13 @@ export class QmdMemoryManager implements MemorySearchManager {
       if (!this.pathsMatch(details.path, collection.path)) {
         continue;
       }
-      if (details.pattern !== collection.pattern) {
+      if (
+        !this.patternsMatchForManagedCollection(
+          collection.path,
+          details.pattern,
+          collection.pattern,
+        )
+      ) {
         continue;
       }
       return name;
@@ -621,7 +628,14 @@ export class QmdMemoryManager implements MemorySearchManager {
     if (listedLegacy.path && !this.pathsMatch(listedLegacy.path, collection.path)) {
       return false;
     }
-    if (typeof listedLegacy.pattern === "string" && listedLegacy.pattern !== collection.pattern) {
+    if (
+      typeof listedLegacy.pattern === "string" &&
+      !this.patternsMatchForManagedCollection(
+        collection.path,
+        listedLegacy.pattern,
+        collection.pattern,
+      )
+    ) {
       return false;
     }
     return true;
@@ -787,10 +801,10 @@ export class QmdMemoryManager implements MemorySearchManager {
   }
 
   private shouldRebindCollection(collection: ManagedCollection, listed: ListedCollection): boolean {
-    if (typeof listed.pattern === "string" && listed.pattern !== collection.pattern) {
-      return true;
-    }
     if (!listed.path) {
+      if (typeof listed.pattern === "string" && listed.pattern !== collection.pattern) {
+        return true;
+      }
       // Older qmd versions may only return names from `collection list --json`.
       // If the pattern is also missing, do not perform destructive rebinds when
       // metadata is incomplete: remove+add can permanently drop collections if
@@ -800,9 +814,63 @@ export class QmdMemoryManager implements MemorySearchManager {
     if (!this.pathsMatch(listed.path, collection.path)) {
       return true;
     }
+    if (
+      typeof listed.pattern === "string" &&
+      !this.patternsMatchForManagedCollection(collection.path, listed.pattern, collection.pattern)
+    ) {
+      return true;
+    }
     return false;
   }
 
+  private patternsMatchForManagedCollection(
+    collectionPath: string,
+    leftPattern: string,
+    rightPattern: string,
+  ): boolean {
+    if (leftPattern === rightPattern) {
+      return true;
+    }
+    return this.isEquivalentDefaultMemoryRootPattern(collectionPath, leftPattern, rightPattern);
+  }
+
+  private isEquivalentDefaultMemoryRootPattern(
+    collectionPath: string,
+    leftPattern: string,
+    rightPattern: string,
+  ): boolean {
+    if (
+      !this.isDefaultMemoryRootPattern(leftPattern) ||
+      !this.isDefaultMemoryRootPattern(rightPattern)
+    ) {
+      return false;
+    }
+    try {
+      let sawCanonical = false;
+      let sawLegacyFallback = false;
+      for (const entry of fsSync.readdirSync(collectionPath, { withFileTypes: true })) {
+        if (entry.isSymbolicLink() || !entry.isFile()) {
+          continue;
+        }
+        if (entry.name === "MEMORY.md") {
+          sawCanonical = true;
+        } else if (entry.name === "memory.md") {
+          sawLegacyFallback = true;
+        }
+      }
+      if (sawCanonical && sawLegacyFallback) {
+        return false;
+      }
+      return sawCanonical || sawLegacyFallback;
+    } catch {
+      return false;
+    }
+  }
+
+  private isDefaultMemoryRootPattern(pattern: string): boolean {
+    return pattern === "MEMORY.md" || pattern === "memory.md";
+  }
+
   private pathsMatch(left: string, right: string): boolean {
     const normalize = (value: string): string => {
       const resolved = path.isAbsolute(value)
diff --git a/packages/memory-host-sdk/src/host/backend-config.test.ts b/packages/memory-host-sdk/src/host/backend-config.test.ts
index 19dc6a87af8..55c38292844 100644
--- a/packages/memory-host-sdk/src/host/backend-config.test.ts
+++ b/packages/memory-host-sdk/src/host/backend-config.test.ts
@@ -1,7 +1,9 @@
+import syncFs from "node:fs";
+import type { Dirent } from "node:fs";
 import fs from "node:fs/promises";
 import os from "node:os";
 import path from "node:path";
-import { describe, expect, it } from "vitest";
+import { describe, expect, it, vi } from "vitest";
 import { resolveAgentWorkspaceDir } from "../../../../src/agents/agent-scope.js";
 import type { OpenClawConfig } from "../../../../src/config/config.js";
 import { resolveMemoryBackendConfig } from "./backend-config.js";
@@ -28,7 +30,7 @@ describe("resolveMemoryBackendConfig", () => {
     } as OpenClawConfig;
     const resolved = resolveMemoryBackendConfig({ cfg, agentId: "main" });
     expect(resolved.backend).toBe("qmd");
-    expect(resolved.qmd?.collections.length).toBeGreaterThanOrEqual(3);
+    expect(resolved.qmd?.collections.length).toBe(2);
     expect(resolved.qmd?.command).toBe("qmd");
     expect(resolved.qmd?.searchMode).toBe("search");
     expect(resolved.qmd?.update.intervalMs).toBeGreaterThan(0);
@@ -38,8 +40,91 @@ describe("resolveMemoryBackendConfig", () => {
     expect(resolved.qmd?.update.embedTimeoutMs).toBe(120_000);
     const names = new Set((resolved.qmd?.collections ?? []).map((collection) => collection.name));
     expect(names.has("memory-root-main")).toBe(true);
-    expect(names.has("memory-alt-main")).toBe(true);
     expect(names.has("memory-dir-main")).toBe(true);
+    expect(names.has("memory-alt-main")).toBe(false);
+    const rootCollection = resolved.qmd?.collections.find(
+      (collection) => collection.name === "memory-root-main",
+    );
+    expect(rootCollection?.pattern).toBe("MEMORY.md");
+  });
+
+  it("uses lowercase memory.md as the root fallback when MEMORY.md is absent", () => {
+    const workspaceDir = "/workspace/root";
+    const legacyEntry = {
+      name: "memory.md",
+      isFile: () => true,
+      isSymbolicLink: () => false,
+    } as Dirent;
+    const readdirSpy = vi
+      .spyOn(syncFs, "readdirSync")
+      .mockReturnValue([legacyEntry] as unknown as ReturnType<typeof syncFs.readdirSync>);
+    try {
+      const cfg = {
+        agents: {
+          defaults: { workspace: workspaceDir },
+          list: [{ id: "main", default: true, workspace: workspaceDir }],
+        },
+        memory: {
+          backend: "qmd",
+          qmd: {},
+        },
+      } as OpenClawConfig;
+      const resolved = resolveMemoryBackendConfig({ cfg, agentId: "main" });
+      const rootCollection = resolved.qmd?.collections.find(
+        (collection) => collection.name === "memory-root-main",
+      );
+      expect(rootCollection?.pattern).toBe("memory.md");
+      expect(
+        (resolved.qmd?.collections ?? []).some(
+          (collection) => collection.name === "memory-alt-main",
+        ),
+      ).toBe(false);
+    } finally {
+      readdirSpy.mockRestore();
+    }
+  });
+
+  it("prefers MEMORY.md over legacy memory.md when both root files exist", () => {
+    const workspaceDir = "/workspace/root";
+    const entries = [
+      {
+        name: "MEMORY.md",
+        isFile: () => true,
+        isSymbolicLink: () => false,
+      },
+      {
+        name: "memory.md",
+        isFile: () => true,
+        isSymbolicLink: () => false,
+      },
+    ] as Dirent[];
+    const readdirSpy = vi
+      .spyOn(syncFs, "readdirSync")
+      .mockReturnValue(entries as unknown as ReturnType<typeof syncFs.readdirSync>);
+    try {
+      const cfg = {
+        agents: {
+          defaults: { workspace: workspaceDir },
+          list: [{ id: "main", default: true, workspace: workspaceDir }],
+        },
+        memory: {
+          backend: "qmd",
+          qmd: {},
+        },
+      } as OpenClawConfig;
+      const resolved = resolveMemoryBackendConfig({ cfg, agentId: "main" });
+      const rootCollection = resolved.qmd?.collections.find(
+        (collection) => collection.name === "memory-root-main",
+      );
+      expect(rootCollection?.pattern).toBe("MEMORY.md");
+      expect(
+        (resolved.qmd?.collections ?? []).some(
+          (collection) => collection.name === "memory-alt-main",
+        ),
+      ).toBe(false);
+    } finally {
+      readdirSpy.mockRestore();
+    }
   });
 
   it("parses quoted qmd command paths", () => {
diff --git a/packages/memory-host-sdk/src/host/backend-config.ts b/packages/memory-host-sdk/src/host/backend-config.ts
index 8d5b2804880..54c503955bf 100644
--- a/packages/memory-host-sdk/src/host/backend-config.ts
+++ b/packages/memory-host-sdk/src/host/backend-config.ts
@@ -318,6 +318,34 @@ function resolveMcporterConfig(raw?: MemoryQmdMcporterConfig): ResolvedQmdMcport
   return parsed;
 }
 
+function isRegularDefaultMemoryEntry(
+  entry: Pick<fs.Dirent, "name" | "isFile" | "isSymbolicLink">,
+  expectedName: string,
+): boolean {
+  return entry.name === expectedName && entry.isFile() && !entry.isSymbolicLink();
+}
+
+function findDefaultMemoryRootPattern(workspaceDir: string): string | null {
+  try {
+    let sawLegacyFallback = false;
+    for (const entry of fs.readdirSync(workspaceDir, { withFileTypes: true })) {
+      if (isRegularDefaultMemoryEntry(entry, "MEMORY.md")) {
+        return "MEMORY.md";
+      }
+      if (isRegularDefaultMemoryEntry(entry, "memory.md")) {
+        sawLegacyFallback = true;
+      }
+    }
+    return sawLegacyFallback ? "memory.md" : null;
+  } catch {
+    return null;
+  }
+}
+
+function resolveDefaultMemoryRootPattern(workspaceDir: string): string {
+  return findDefaultMemoryRootPattern(workspaceDir) ?? "MEMORY.md";
+}
+
 function resolveDefaultCollections(
   include: boolean,
   workspaceDir: string,
@@ -328,8 +356,13 @@ function resolveDefaultCollections(
     return [];
   }
   const entries: Array<{ path: string; pattern: string; base: string }> = [
-    { path: workspaceDir, pattern: "MEMORY.md", base: "memory-root" },
-    { path: workspaceDir, pattern: "memory.md", base: "memory-alt" },
+    // The root memory slot is singular: prefer MEMORY.md, but keep lowercase
+    // memory.md as a legacy fallback when the canonical file is absent.
+    {
+      path: workspaceDir,
+      pattern: resolveDefaultMemoryRootPattern(workspaceDir),
+      base: "memory-root",
+    },
     { path: path.join(workspaceDir, "memory"), pattern: "**/*.md", base: "memory-dir" },
   ];
   return entries.map((entry) => ({
diff --git a/packages/memory-host-sdk/src/host/internal.test.ts b/packages/memory-host-sdk/src/host/internal.test.ts
index 465a63abc8a..a969aaf0cf8 100644
--- a/packages/memory-host-sdk/src/host/internal.test.ts
+++ b/packages/memory-host-sdk/src/host/internal.test.ts
@@ -78,6 +78,25 @@ describe("listMemoryFiles", () => {
     expect(files.some((file) => file.endsWith("standalone.md"))).toBe(true);
   });
 
+  it("uses lowercase memory.md as the root fallback when MEMORY.md is absent", async () => {
+    const tmpDir = getTmpDir();
+    await fs.writeFile(path.join(tmpDir, "memory.md"), "# Legacy memory");
+
+    const files = await listMemoryFiles(tmpDir);
+
+    expect(files).toEqual([path.join(tmpDir, "memory.md")]);
+  });
+
+  it("prefers MEMORY.md when both root files exist", async () => {
+    const tmpDir = getTmpDir();
+    await fs.writeFile(path.join(tmpDir, "MEMORY.md"), "# Default memory");
+    await fs.writeFile(path.join(tmpDir, "memory.md"), "# Legacy memory");
+
+    const files = await listMemoryFiles(tmpDir);
+
+    expect(files).toEqual([path.join(tmpDir, "MEMORY.md")]);
+  });
+
   it("handles relative paths in additional paths", async () => {
     const tmpDir = getTmpDir();
     await fs.writeFile(path.join(tmpDir, "MEMORY.md"), "# Default memory");
diff --git a/packages/memory-host-sdk/src/host/internal.ts b/packages/memory-host-sdk/src/host/internal.ts
index bb64bd1c2c0..22979832ea0 100644
--- a/packages/memory-host-sdk/src/host/internal.ts
+++ b/packages/memory-host-sdk/src/host/internal.ts
@@ -113,14 +113,33 @@ async function walkDir(dir: string, files: string[], multimodal?: MemoryMultimod
   }
 }
 
+async function resolveDefaultMemoryRootFile(workspaceDir: string): Promise<string | null> {
+  try {
+    let legacyFallback: string | null = null;
+    const entries = await fs.readdir(workspaceDir, { withFileTypes: true });
+    for (const entry of entries) {
+      if (entry.isSymbolicLink() || !entry.isFile()) {
+        continue;
+      }
+      if (entry.name === "MEMORY.md") {
+        return path.join(workspaceDir, entry.name);
+      }
+      if (entry.name === "memory.md") {
+        legacyFallback = path.join(workspaceDir, entry.name);
+      }
+    }
+    return legacyFallback;
+  } catch {
+    return null;
+  }
+}
+
 export async function listMemoryFiles(
   workspaceDir: string,
   extraPaths?: string[],
   multimodal?: MemoryMultimodalSettings,
 ): Promise<string[]> {
   const result: string[] = [];
-  const memoryFile = path.join(workspaceDir, "MEMORY.md");
-  const altMemoryFile = path.join(workspaceDir, "memory.md");
   const memoryDir = path.join(workspaceDir, "memory");
 
   const addMarkdownFile = async (absPath: string) => {
@@ -136,8 +155,10 @@ export async function listMemoryFiles(
     } catch {}
   };
 
-  await addMarkdownFile(memoryFile);
-  await addMarkdownFile(altMemoryFile);
+  const rootMemoryFile = await resolveDefaultMemoryRootFile(workspaceDir);
+  if (rootMemoryFile) {
+    await addMarkdownFile(rootMemoryFile);
+  }
   try {
     const dirStat = await fs.lstat(memoryDir);
     if (!dirStat.isSymbolicLink() && dirStat.isDirectory()) {