diff --git a/src/components/Map/markerManager.js b/src/components/Map/markerManager.js
index 0333420..8af6da9 100644
--- a/src/components/Map/markerManager.js
+++ b/src/components/Map/markerManager.js
@@ -1964,8 +1964,8 @@ export function openCenteredOverlay({ map, post, theme, fullScreen = false }) {
     };
     const voteUp = rail.querySelector(".sw-truth-rail-btn-up");
     const voteDown = rail.querySelector(".sw-truth-rail-btn-down");
-    if (voteUp) voteUp.addEventListener("click", () => doVote("true"));
-    if (voteDown) voteDown.addEventListener("click", () => doVote("false"));
+    if (voteUp) voteUp.addEventListener("click", (e) => { e.stopPropagation(); doVote("true"); });
+    if (voteDown) voteDown.addEventListener("click", (e) => { e.stopPropagation(); doVote("false"); });
   }
 
   applyAuthUI();
diff --git a/src/components/Map/usePostsEngine.js b/src/components/Map/usePostsEngine.js
index b12cd12..37d0a4a 100644
--- a/src/components/Map/usePostsEngine.js
+++ b/src/components/Map/usePostsEngine.js
@@ -1427,7 +1427,13 @@ export function usePostsEngine({
         }
         if (changed) {
           allPostsRef.current = updated;
-          refreshVisibleAndMarkers(timeHours, true);
+          // Skip full marker refresh if this post's modal is open - we update UI in-place below
+          const map = mapRef.current;
+          const ov = map?.__swCenteredOverlay;
+          const isModalOpen = ov && ov.postId === postId;
+          if (!isModalOpen) {
+            refreshVisibleAndMarkers(timeHours, true);
+          }
         }
       };