diff --git a/src/components/Map/MapView.jsx b/src/components/Map/MapView.jsx
index 013740d..04c9cb6 100644
--- a/src/components/Map/MapView.jsx
+++ b/src/components/Map/MapView.jsx
@@ -33,7 +33,7 @@ export default function MapView({
   onOpenIslands,
 }) {
   const { authenticated, username, token, needsEmailVerification } = useAuth();
-  const CLUSTERS_ENABLED = true;
+  const CLUSTERS_ENABLED = false;
   const HEATMAP_ENABLED = false;
 
   const { containerRef, mapRef, markersRef, expandedElRef, viewParams, hasLastView } =
@@ -53,6 +53,15 @@ export default function MapView({
   const [subFilter, setSubFilter] = useState("All");
   const [mainNewsOnly, setMainNewsOnly] = useState(false);
 
+  const debugEnabled = (() => {
+    try {
+      return typeof window !== "undefined" &&
+        new URLSearchParams(window.location.search || "").has("debug");
+    } catch {
+      return false;
+    }
+  })();
+
   useEffect(() => {
     try {
       localStorage.setItem(TIME_FILTER_KEY, String(timeHours));
@@ -157,7 +166,7 @@ export default function MapView({
     [mapRef]
   );
 
-  const { status, visiblePosts, loadingPosts, loadError, handleIncomingPost, handlePostUpdate } =
+  const { status, debugStatus, visiblePosts, loadingPosts, loadError, handleIncomingPost, handlePostUpdate } =
     usePostsEngine({
       theme,
       mapRef,
@@ -176,6 +185,7 @@ export default function MapView({
       onAutoWidenTimeFilter: () => setTimeHours(336),
       onSelectPost,
       username,
+      debugEnabled,
     });
 
   const [isCreating, setIsCreating] = useState(false);
@@ -324,15 +334,24 @@ export default function MapView({
     if (queryPostRef.current) return;
     const qs = new URLSearchParams(window.location.search || "");
     let idRaw = qs.get("post_id") || qs.get("id") || qs.get("p");
+    let wasSharedLink = false;
     if (!idRaw) {
       const path = (window.location.pathname || "").trim();
       const m = path.match(/^\/p\/(\d+)/);
       if (m && m[1]) {
         idRaw = m[1];
+        wasSharedLink = true;
+        // Clean URL immediately - no post_id in URL, just stay on root
         try {
-          window.history.replaceState(null, "", `/?post_id=${m[1]}`);
+          window.history.replaceState(null, "", "/");
         } catch {}
       }
+    } else {
+      // If arrived with ?post_id=123, also clean it
+      wasSharedLink = true;
+      try {
+        window.history.replaceState(null, "", "/");
+      } catch {}
     }
     if (!idRaw) return;
     queryPostRef.current = true;
@@ -1211,6 +1230,47 @@ export default function MapView({
       <div className="map-stage" ref={stageRef}>
         <div ref={containerRef} className="map-container" />
         {status && <div className="map-status">{status}</div>}
+        {debugEnabled && (
+          <>
+            <div
+              className="sw-debug-banner"
+              style={{
+                position: "fixed",
+                top: 62,
+                left: 8,
+                zIndex: 99999,
+                padding: "6px 8px",
+                background: "rgba(0,0,0,0.8)",
+                color: "#fff",
+                fontSize: 12,
+                borderRadius: 6,
+                maxWidth: "92vw",
+                pointerEvents: "none",
+              }}
+            >
+              {debugStatus || "debug active"}
+            </div>
+            <div
+              style={{
+                position: "fixed",
+                bottom: 0,
+                left: 0,
+                right: 0,
+                zIndex: 99999,
+                background: "#ffea00",
+                color: "#111",
+                fontWeight: 700,
+                fontSize: 14,
+                textAlign: "center",
+                padding: "4px 0",
+                letterSpacing: "0.08em",
+                pointerEvents: "none",
+              }}
+            >
+              DEV DEBUG
+            </div>
+          </>
+        )}
 
         {/* TOP: Search avec suggestions intelligentes */}
         <div className="map-overlay map-overlay-top">
diff --git a/src/components/Map/usePostsEngine.js b/src/components/Map/usePostsEngine.js
index f44aa8f..a0590aa 100644
--- a/src/components/Map/usePostsEngine.js
+++ b/src/components/Map/usePostsEngine.js
@@ -372,6 +372,7 @@ export function usePostsEngine({
   onAutoWidenTimeFilter,
   onSelectPost,
   username,
+  debugEnabled = false,
   theme = "blue",
 }) {
   const allPostsRef = useRef([]);
@@ -707,6 +708,7 @@ export function usePostsEngine({
   );
 
   const [status, setStatus] = useState("");
+  const [debugStatus, setDebugStatus] = useState("debug active");
   const [visiblePosts, setVisiblePosts] = useState([]);
   const [loadingPosts, setLoadingPosts] = useState(false);
   const [loadError, setLoadError] = useState("");
@@ -735,12 +737,6 @@ export function usePostsEngine({
       fullCardPosts = prioritized.fullCardPosts;
       simpleMarkerPosts = prioritized.simpleMarkerPosts;
 
-      console.log('[usePostsEngine] Prioritized:', {
-        total: visible.length,
-        fullCards: fullCardPosts.length,
-        simpleMarkers: simpleMarkerPosts.length
-      });
-
       // Combine both types for "wanted" tracking
       const wanted = new Map();
       for (const post of visible) {
@@ -823,8 +819,7 @@ export function usePostsEngine({
     replacePoolRef.current = true;
     pendingFilterRef.current = `${mainFilter}|${subFilter}|${timeHours}`;
     allPostsRef.current = [];
-    setVisiblePosts([]);
-    syncMarkers([]);
+    autoWidenRef.current = false; // Reset auto-widen when user manually changes filter
     if (map && clustersEnabled && heatmapEnabled) {
       updateClusterAreas(map, []);
     }
@@ -836,7 +831,7 @@ export function usePostsEngine({
         } catch {}
       }, 60);
     }
-  }, [mainFilter, subFilter, timeHours, mapRef, syncMarkers, clustersEnabled, heatmapEnabled, updateClusterAreas]);
+  }, [mainFilter, subFilter, timeHours, mapRef, clustersEnabled, heatmapEnabled, updateClusterAreas]);
 
   const computeVisible = useCallback(
     (tf) => {
@@ -1104,6 +1099,11 @@ export function usePostsEngine({
         // Smooth update: sync markers/clusters + wall without clearing everything
         refreshVisibleAndMarkers(timeHours);
         const visible = computeVisible(timeHours);
+        if (debugEnabled) {
+          const count = Array.isArray(newPosts) ? newPosts.length : 0;
+          const q = (searchQuery || "").trim();
+          setDebugStatus(`tf:${timeHours || 0} fetched:${count} visible:${visible.length}${q ? ` q:${q}` : ""}`);
+        }
         const now = Date.now();
         if (now - analyticsDebounceRef.current > 4000) {
           analyticsDebounceRef.current = now;
@@ -1387,5 +1387,5 @@ export function usePostsEngine({
     [mapRef, refreshVisibleAndMarkers, timeHours]
   );
 
-  return { status, visiblePosts, loadingPosts, loadError, handleIncomingPost, handlePostUpdate };
+  return { status, debugStatus, visiblePosts, loadingPosts, loadError, handleIncomingPost, handlePostUpdate };
 }
diff --git a/src/styles/layout.css b/src/styles/layout.css
index 41f23aa..26d2af5 100644
--- a/src/styles/layout.css
+++ b/src/styles/layout.css
@@ -121,4 +121,4 @@
 }
 
 /* Espace pour les bulles */
-.below-stage { padding-bottom: 70px; }
\ No newline at end of file
+.below-stage { padding-bottom: 70px; }
diff --git a/src/styles/map.css b/src/styles/map.css
index 2eb0a4b..ef2c99b 100644
--- a/src/styles/map.css
+++ b/src/styles/map.css
@@ -48,6 +48,7 @@
   position:relative;
   z-index:25;
   padding: .25rem .7rem 1.0rem;
+  transition: opacity 320ms ease, filter 320ms ease;
 }
 
 .below-row{