diff --git a/internal/admin/handler_raw_samples.go b/internal/admin/handler_raw_samples.go
index 4bf85a8..c9ad58e 100644
--- a/internal/admin/handler_raw_samples.go
+++ b/internal/admin/handler_raw_samples.go
@@ -324,11 +324,13 @@ func buildCaptureChains(snapshot []devcapture.Entry) []captureChain {
 		return nil
 	}
 	ordered := make([]devcapture.Entry, len(snapshot))
-	copy(ordered, snapshot)
+	// devcapture snapshots are newest-first because the store prepends entries.
+	// Reverse once so equal-second timestamps can preserve the actual capture
+	// order (completion before continue) under the stable CreatedAt sort below.
+	for i := range snapshot {
+		ordered[len(snapshot)-1-i] = snapshot[i]
+	}
 	sort.SliceStable(ordered, func(i, j int) bool {
-		if ordered[i].CreatedAt == ordered[j].CreatedAt {
-			return ordered[i].ID < ordered[j].ID
-		}
 		return ordered[i].CreatedAt < ordered[j].CreatedAt
 	})
 
diff --git a/internal/admin/handler_raw_samples_test.go b/internal/admin/handler_raw_samples_test.go
index fa15e45..de4fa03 100644
--- a/internal/admin/handler_raw_samples_test.go
+++ b/internal/admin/handler_raw_samples_test.go
@@ -285,6 +285,39 @@ func TestQueryRawSampleCapturesGroupsBySessionAndMatchesQuestion(t *testing.T) {
 	}
 }
 
+func TestBuildCaptureChainsPreservesCaptureOrderWhenTimestampsCollide(t *testing.T) {
+	snapshot := []devcapture.Entry{
+		{
+			ID:          "cap_continue",
+			CreatedAt:   1712365200,
+			Label:       "deepseek_continue",
+			RequestBody: `{"chat_session_id":"session-collision","message_id":2}`,
+			ResponseBody: "data: {\"v\":\"第二段\"}\n\n",
+		},
+		{
+			ID:          "cap_completion",
+			CreatedAt:   1712365200,
+			Label:       "deepseek_completion",
+			RequestBody: `{"chat_session_id":"session-collision","prompt":"题目"}`,
+			ResponseBody: "data: {\"v\":\"第一段\"}\n\n",
+		},
+	}
+
+	chains := buildCaptureChains(snapshot)
+	if len(chains) != 1 {
+		t.Fatalf("expected 1 chain, got %d", len(chains))
+	}
+	if len(chains[0].Entries) != 2 {
+		t.Fatalf("expected 2 entries, got %d", len(chains[0].Entries))
+	}
+	if chains[0].Entries[0].Label != "deepseek_completion" {
+		t.Fatalf("expected completion first, got %#v", chains[0].Entries)
+	}
+	if chains[0].Entries[1].Label != "deepseek_continue" {
+		t.Fatalf("expected continue second, got %#v", chains[0].Entries)
+	}
+}
+
 func TestSaveRawSampleFromCapturesPersistsSelectedChain(t *testing.T) {
 	root := t.TempDir()
 	t.Setenv("DS2API_RAW_STREAM_SAMPLE_ROOT", root)