diff --git a/CompleteMoveOnEdge.js b/CompleteMoveOnEdge.js
index a66fa03..a785ada 100644
--- a/CompleteMoveOnEdge.js
+++ b/CompleteMoveOnEdge.js
@@ -29,6 +29,7 @@ class CompleteNodeOnEdgeEngine {
         this.timer = null;
         this.lastTime = 0;
         this.targetInterval = this.time_delay;
+        this._movementInitialized = false;
     }
 
     setArrivalCallback(callback) {
@@ -39,6 +40,10 @@ class CompleteNodeOnEdgeEngine {
      * Initializes the movement of the nodes on edges.
      */
     initMovement() {
+        if (this._movementInitialized) {
+            return;
+        }
+        this._movementInitialized = true;
         // Update the position of the dot node before the redraw event
         this.network.on('beforeDrawing', (ctx) => {
             if (this.edgesMoved) {
diff --git a/script.js b/script.js
index a3c0e05..8016a7e 100644
--- a/script.js
+++ b/script.js
@@ -299,12 +299,11 @@ document.getElementById('addNode').addEventListener('click', function() {
 
 document.getElementById('sendPacket').addEventListener('click', function() {
     onEdgeEngine.createEdgesTable();
-    onEdgeEngine.initMovement();
     const packetId = generateRealisticLabel();
-    const packetShift = 0;
+    let packetShift = 0;
     for (let connection of nodeTable[selectedNode].outgoing) {
         var movingNode = {
-            id: packetId + packetShift,
+            id: `${packetId}-${packetShift}`,
             label: packetId,
             shape: 'dot',
             size: 6,