Loading Prefabs from path [Strange Behaviour]

Hi people! I'm starting developing some editor tools to create a lib and i have one strange behaviour with something in particular.
I'm creating a simple inspector tool that shows me all the prefabs and when i click on one of them it creates an empty gameobject and inside a prefab (so i dont have that prefab into prefab problem)
Everything works great, the list its ok and shows every prefab in a specific folder but when i change the prefab in the scene and i hit apply i get a duplicated item in the list.
I will leave screenshots so you can see it more clearly

Step one:
I see my prefabs list, you can see the folder Cubes and the list of prefabs on the levelEditor
https://postimg.org/image/dg26new87/

Step Two:
I created an object containing the prefab Cube1
https://postimg.org/image/49ohdvgdj/

Step Three:
I modified the prefab adding a cylinder inside of it and hitting apply, the the object is duplicated in the list
https://postimg.org/image/aoniajn3b/

I'm using this to load all assets of a path

Code (CSharp):

1. public static Object[] LoadAllAssetsAtPath(string path)
2.     {
3.         if(path.EndsWith("/"))
4.         {
5.             path = path.TrimEnd('/');
6.         }
7.         string[] GUIDs = AssetDatabase.FindAssets("", new string[] {path});
8.         Object[] objectList = new Object[GUIDs.Length];
9.         for (int index = 0; index < GUIDs.Length; index++)
10.         {
11.             string guid = GUIDs[index];
12.             string assetPath = AssetDatabase.GUIDToAssetPath(guid);
13.             Object asset = AssetDatabase.LoadAssetAtPath(assetPath, typeof(Object)) as Object;
14.             objectList[index] = asset;
15.         }
16.         return objectList;
17.     }