Wierd Behaviour with inventory widget

I’m having some problems with my inventory widget, basically :

Single-player = everything works fine

Listen Server : Server works fine, but the player can’t interact with the widget. The widget is spawned locally. I can press a key and see the widget but I can’t interact with it.

dedicated server :

1 client: everything works fine

2+ client: widget will spawn but no player can interact with it.

any idea why?