diff --git a/frontend/assets/js/app.js b/frontend/assets/js/app.js
index b53827a..e0762d5 100644
--- a/frontend/assets/js/app.js
+++ b/frontend/assets/js/app.js
@@ -24,6 +24,7 @@ let dragType = null;
 let dragOffX, dragOffY;
 let dragHandle = null;
 let dragOrig = null;
+let dragNodeIds = null;
 let selectStartX, selectStartY;
 let selectRect = null;
 
@@ -1221,9 +1222,8 @@ let syncHashes = { events: null, documents: null, network: null };
 function startSync() {
     if (syncInterval) return;
     syncInterval = setInterval(async () => {
-        // Skip sync if a modal is open (user is editing)
+        if (dragType || dragTarget || isPanning) return;
         const openModals = document.querySelectorAll('.modal.show');
-        if (openModals.length > 0) return;
         try {
             const [eventsData, docsData, nodesData, linksData, shapesData] = await Promise.all([
                 apiFetch('events'),
@@ -1312,6 +1312,7 @@ function onMouseDown(e) {
         if (e.shiftKey) { selectNode(node.id, true); }
         else if (!selectedNodeIds.includes(node.id)) { selectNode(node.id); }
         dragType = 'node'; dragTarget = node;
+        dragNodeIds = [...selectedNodeIds];
         dragOffX = mx - node.x; dragOffY = my - node.y;
         return;
     }
@@ -1338,10 +1339,10 @@ function onMouseDown(e) {
 
 function onMouseMove(e) {
     const rect = canvas.getBoundingClientRect();
-    if (dragType === 'node' && dragTarget) {
+    if (dragType === 'node' && dragNodeIds) {
         const dx = e.clientX - rect.left - panX - dragOffX - dragTarget.x;
         const dy = e.clientY - rect.top - panY - dragOffY - dragTarget.y;
-        for (const c of canvasNodes) { if (selectedNodeIds.includes(c.id)) { c.x += dx; c.y += dy; } }
+        for (const c of canvasNodes) { if (dragNodeIds.includes(c.id)) { c.x += dx; c.y += dy; } }
         renderNetwork(); return;
     }
     if (dragType === 'shape' && dragTarget) {
@@ -1385,8 +1386,11 @@ function onMouseMove(e) {
 }
 
 function onMouseUp(e) {
-    if (dragType === 'node') {
-        for (const c of canvasNodes) { if (selectedNodeIds.includes(c.id)) apiFetch('nodes/' + c.id, { method: 'PUT', body: JSON.stringify({ pos_x: c.x, pos_y: c.y }) }); }
+    if (dragType === 'node' && dragNodeIds) {
+        for (const id of dragNodeIds) {
+            const c = canvasNodes.find(n => n.id === id);
+            if (c) apiFetch('nodes/' + id, { method: 'PUT', body: JSON.stringify({ pos_x: c.x, pos_y: c.y }) });
+        }
     } else if (dragTarget && (dragType === 'shape' || dragType === 'resize')) {
         apiFetch('shapes/' + dragTarget.id, { method: 'PUT', body: JSON.stringify({ pos_x: dragTarget.x, pos_y: dragTarget.y, width: dragTarget.w, height: dragTarget.h }) });
     } else if (dragType === 'select') {
@@ -1406,7 +1410,7 @@ function onMouseUp(e) {
             renderNodeList(); renderShapeList(); renderNetwork();
         }
     }
-    dragType = null; dragTarget = null; dragOrig = null;
+    dragType = null; dragTarget = null; dragOrig = null; dragNodeIds = null;
     selectRect = null;
     isPanning = false;
     canvas.style.cursor = 'grab';