diff --git a/ui/src/pages/chat/chat-pane-history.test.ts b/ui/src/pages/chat/chat-pane-history.test.ts
index 3696e228e282..8b28789331e7 100644
--- a/ui/src/pages/chat/chat-pane-history.test.ts
+++ b/ui/src/pages/chat/chat-pane-history.test.ts
@@ -8,6 +8,7 @@ import type { ApplicationContext } from "../../app/context.ts";
 import type { SessionCapability } from "../../lib/sessions/index.ts";
 import "./chat-pane.ts";
 import { loadChatHistory } from "./chat-history.ts";
+import { nativeHistoryMessageIdentity } from "./chat-pane-shared.ts";
 import type { ChatPageHost } from "./chat-state-host.ts";
 
 type TestChatPane = HTMLElement & {
@@ -516,8 +517,14 @@ describe("chat pane native history pagination", () => {
     const client = { request: vi.fn() } as unknown as GatewayBrowserClient;
     const { pane } = createTestChatPane({ client, sessions: {} as SessionCapability });
     const projected = [
-      nativeHistoryMessage(1, "tool call"),
-      nativeHistoryMessage(1, "visible tool reply"),
+      {
+        ...nativeHistoryMessage(1, "Same routed send"),
+        openclawMessageToolMirror: { toolName: "message", toolCallId: "call-a" },
+      },
+      {
+        ...nativeHistoryMessage(1, "Same routed send"),
+        openclawMessageToolMirror: { toolName: "message", toolCallId: "call-b" },
+      },
     ];
 
     expect(pane.prependUniqueNativeMessages(projected, [nativeHistoryMessage(2)])).toEqual([
@@ -530,6 +537,37 @@ describe("chat pane native history pagination", () => {
     ).toEqual([projected[0], projected[1], nativeHistoryMessage(2)]);
   });
 
+  it("deduplicates byte-different live-event and history projections of one transcript row", () => {
+    const client = { request: vi.fn() } as unknown as GatewayBrowserClient;
+    const { pane } = createTestChatPane({ client, sessions: {} as SessionCapability });
+    const liveEventProjection = {
+      role: "assistant",
+      content: [{ type: "text", text: "One stored reply" }],
+      __openclaw: {
+        id: "assistant-message-42",
+        idempotencyKey: "run-42",
+        seq: 42,
+      },
+    };
+    const historyProjection = {
+      role: "assistant",
+      content: [{ type: "text", text: "One stored reply" }],
+      __openclaw: {
+        id: "assistant-message-42",
+        idempotencyKey: "run-42",
+        recordTimestampMs: 1_786_000_000_000,
+        seq: 42,
+      },
+    };
+
+    expect(nativeHistoryMessageIdentity(liveEventProjection)).toBe(
+      nativeHistoryMessageIdentity(historyProjection),
+    );
+    expect(pane.prependUniqueNativeMessages([historyProjection], [liveEventProjection])).toEqual([
+      liveEventProjection,
+    ]);
+  });
+
   it("deduplicates projected catalog transcript records by catalog message id", () => {
     const client = { request: vi.fn() } as unknown as GatewayBrowserClient;
     const { pane } = createTestChatPane({ client, sessions: {} as SessionCapability });
diff --git a/ui/src/pages/chat/chat-pane-shared.ts b/ui/src/pages/chat/chat-pane-shared.ts
index 4dac2b306e8d..cea0cb0308d8 100644
--- a/ui/src/pages/chat/chat-pane-shared.ts
+++ b/ui/src/pages/chat/chat-pane-shared.ts
@@ -213,10 +213,12 @@ export function nativeHistoryMessageIdentity(message: unknown): string | null {
   if (!sourceIdentity) {
     return null;
   }
+  const { recordTimestampMs: _recordTimestampMs, ...projectionMetadata } = metadata ?? {};
+  const projection = metadata ? { ...record, __openclaw: projectionMetadata } : record;
   try {
-    // One transcript record can project to multiple visible siblings. Include
-    // the projection bytes so partial page overlap removes the matching sibling.
-    return `${sourceIdentity}:${JSON.stringify(message)}`;
+    // History alone adds recordTimestampMs; delivery metadata is not projection identity.
+    // Keep every other projection byte so siblings from one transcript row stay distinct.
+    return `${sourceIdentity}:${JSON.stringify(projection)}`;
   } catch {
     return sourceIdentity;
   }
diff --git a/ui/src/pages/chat/chat-thread.test.ts b/ui/src/pages/chat/chat-thread.test.ts
index 2183008a50f9..0e4ecb432101 100644
--- a/ui/src/pages/chat/chat-thread.test.ts
+++ b/ui/src/pages/chat/chat-thread.test.ts
@@ -2221,18 +2221,21 @@ describe("buildCachedChatItems", () => {
     expect(groupAt(groups, 0).messages).toHaveLength(1);
   });
 
-  it("collapses consecutive duplicate text messages into one rendered item with a count", () => {
+  it("collapses two distinct persisted rows with identical text into one rendered item", () => {
     const groups = messageGroups({
       messages: [
-        assistantMessage([{ type: "text", text: "Same update" }], 1),
-        assistantMessage([{ type: "text", text: "Same update" }], 2),
-        assistantMessage([{ type: "text", text: "Same update" }], 3),
+        assistantMessage([{ type: "text", text: "Same update" }], 1, {
+          __openclaw: { seq: 7 },
+        }),
+        assistantMessage([{ type: "text", text: "Same update" }], 2, {
+          __openclaw: { seq: 8 },
+        }),
       ],
     });
 
     expect(groups).toHaveLength(1);
     expect(groupAt(groups, 0).messages).toHaveLength(1);
-    expect(messageAt(groupAt(groups, 0), 0).duplicateCount).toBe(3);
+    expect(messageAt(groupAt(groups, 0), 0).duplicateCount).toBe(2);
   });
 
   it.each([