The problem was that the array list was too short!
Every scene/.gltf is on click loaded. I’ve used the same for loop jewerly configurator project. (See the attachment)
Every time the user click on a button the .gltf in the current scene is unloaded and replaced by the selected one.
I mean that when the user select another object to replace the one in the current scene, instead of replacing it, get overlapped by the last selected one.
For example if there’s the windowsill A placed in the scene, when i select the windowsill B, windowsill B overlap windowsill A.