Handles not updating Custom Editor

Good Evening All,

I'm having issues with a customer editor script I've written, the problem is when I move the handles I've drawn the editor isn't updated.

Here's what it looks like - http://gfycat.com/PastelShoddyHummingbird

Now here's my code:

Code (CSharp):

1.     public override void OnInspectorGUI ()
2.     {
3.         serializedObject.Update ();
4.  
5.         if (aniDetList.animationDetails.Count > 0) {
6.             UpdateDropDown ();
7.  
8.             PopUpIndex = EditorGUILayout.Popup (PopUpIndex, aniDropDownList);
9.  
10.             aniDetList.animationDetails [PopUpIndex].animationName = EditorGUILayout.TextField ("Animaton Name: ", aniDetList.animationDetails [PopUpIndex].animationName);
11.             waypointFold = EditorGUILayout.Foldout (waypointFold, "Waypoints");
12.  
13.             EditorGUILayout.BeginVertical ();
14.             if (waypointFold) {
15.  
16.                 if (aniDetList.animationDetails [PopUpIndex].wayPoints.Count > 0) {
17.                     for (int i = 0; i < (aniDetList.animationDetails[PopUpIndex].wayPoints.Count); i++) {
18.                         aniDetList.animationDetails [PopUpIndex].wayPoints [i] = EditorGUILayout.Vector3Field ("Waypoint " + i, aniDetList.animationDetails [PopUpIndex].wayPoints [i]);
19.                     }
20.                 } else {
21.                     EditorGUILayout.HelpBox ("No Waypoints for this animation, you need to create some", MessageType.Warning);
22.                 }
23.             }
24.             EditorGUILayout.EndVertical ();
25.             aniDetList.animationDetails [PopUpIndex].loopAnimation = EditorGUILayout.Toggle ("Loop Animaton: ", aniDetList.animationDetails [PopUpIndex].loopAnimation);
26.  
27.             if (GUILayout.Button ("Create new Waypoint")) {
28.                 Debug.Log ("Created new Waypoint, Let's hope it shows!");
29.                 CreateNewWaypoint ();
30.             }
31.            
32.             if (GUILayout.Button ("Create new Animation")) {
33.                 Debug.Log ("Created new Waypoint, Let's hope it shows!");
34.                 CreateNewAnimation ();
35.             }
36.  
37.             if (GUI.changed) {
38.                 EditorUtility.SetDirty (aniDetList);
39.             }
40.  
41.         } else {
42.             EditorGUILayout.HelpBox ("No Animations, Please Create at least one", MessageType.Error);
43.         }
44.  
45.         serializedObject.ApplyModifiedProperties ();
46.     }
47.  
48.     void OnSceneGUI ()
49.     {
50.  
51.         if (aniDetList.animationDetails.Count > 0) {
52.             Handles.color = Color.yellow;
53.             for (int i = 0; i <= (aniDetList.animationDetails[PopUpIndex].wayPoints.Count-1); i++) {
54.                 aniDetList.animationDetails [PopUpIndex].wayPoints [i] = DrawHandle (i);
55.                 if (GUI.changed) {
56.                     EditorUtility.SetDirty (aniDetList);
57.                 }
58.                 if (i == 0) {
59.                     Handles.DrawLine (me.gameObject.transform.position, aniDetList.animationDetails [PopUpIndex].wayPoints [i]);
60.                 } else {
61.                     Handles.DrawLine (aniDetList.animationDetails [PopUpIndex].wayPoints [i - 1], aniDetList.animationDetails [PopUpIndex].wayPoints [i]);
62.                 }
63.             }
64.         }
65.     }
66.  
67.     private Vector3 DrawHandle (int index)
68.     {
69.         Vector3 point = aniDetList.animationDetails [PopUpIndex].wayPoints [index];
70.  
71.         EditorGUI.BeginChangeCheck ();
72.         point = Handles.FreeMoveHandle (point, Quaternion.identity, 0.3f, pointSnap, Handles.DotCap);
73.         if (EditorGUI.EndChangeCheck ()) {
74.             Undo.RecordObject (aniDetList, "Move point");
75.             EditorUtility.SetDirty (aniDetList);
76.             aniDetList.animationDetails [PopUpIndex].wayPoints [index] = point;
77.         }
78.         return point;
79.     }

If I edit the waypoints in the editor the Handles get updated straight away, but when I move the waypoints they don't get updated on the editor until I click on the inspector.

Can anyone see where I've made the mistake? Thanks Everyone.