Mouse prob after Transition to new map

Hi guys, i have added a transition for a MP map where you go from map1 to map2

It is working but sometimes not all, the mouse doesn’t respond and is on top of screen (like hitting windows key)

I tried Google AI but after many hours of getting more lost i ask here.

What would be the cause of it?

character movements are fine, everything good just no mouse look

notes: Hold Right mouse down and you can turn, WSAD work fine, just mouse look.