diff --git a/svelte-app/src/lib/canvas/interactions.ts b/svelte-app/src/lib/canvas/interactions.ts
index c4559aa..70fe533 100644
--- a/svelte-app/src/lib/canvas/interactions.ts
+++ b/svelte-app/src/lib/canvas/interactions.ts
@@ -469,29 +469,9 @@ function onMousemove(e: MouseEvent) {
       localY = worldSnappedY - sym.y;
     }
 
-    // Constrain first/last waypoint to slide along their segment direction only
-    // (extend/shorten without rotating the end boxes)
-    if (wpIdx === 0 && wps.length >= 2) {
-      const next = wps[1];
-      const dx = wps[0].x - next.x, dy = wps[0].y - next.y;
-      const len = Math.sqrt(dx * dx + dy * dy) || 1;
-      const ux = dx / len, uy = dy / len;
-      const dot = (localX - next.x) * ux + (localY - next.y) * uy;
-      localX = next.x + ux * dot;
-      localY = next.y + uy * dot;
-    } else if (wpIdx === wps.length - 1 && wps.length >= 2) {
-      const prev = wps[wps.length - 2];
-      const dx = wps[wpIdx].x - prev.x, dy = wps[wpIdx].y - prev.y;
-      const len = Math.sqrt(dx * dx + dy * dy) || 1;
-      const ux = dx / len, uy = dy / len;
-      const dot = (localX - prev.x) * ux + (localY - prev.y) * uy;
-      localX = prev.x + ux * dot;
-      localY = prev.y + uy * dot;
-    }
-
     wps[wpIdx] = { x: localX, y: localY };
-    // Recalculate bounding box
-    recalcEpcBounds(sym);
+    // Defer recalcEpcBounds to mouseup — updating w/h mid-drag shifts
+    // the rotation center in toSymbolLocal, causing waypoints to jump.
     layout.markDirty();
   }
 
@@ -738,6 +718,8 @@ function onMouseup(e: MouseEvent) {
   }
 
   if (dragState.type === 'epc-waypoint' && dragState.dragActivated) {
+    const sym = layout.symbols.find(s => s.id === dragState!.placedId);
+    if (sym) recalcEpcBounds(sym);
     layout.markDirty();
     layout.saveMcmState();
   }