Restarting level fps drop in blueprint

Good afternoon.

I’m creating a game, and recently discovered one problem. Every time I restart the level, my fps drops just a little bit. This causes me big problems, because on android, it drops even more. I tested this on an empty scene, with a restart level button and an add widget code in the level blueprint. No objects in the scene. I made a video on how this looks like:

The thing that unreal objects appear and then their index increases is also considerable, but it’s not me who creates them

Anyway, I really hope someone could help me out with this :S