Weird visual glitch, *GIF inside*

Any clues?

The things that could go wrong in my specific project would be replication/networking, it’s a co-op for 2. And questionable setup of level streaming.

Someone have experienced something similar?

Edit:

Have more information.

When Shadows are turned off it doesn’t happen.

Also it happens when there’s 2 flashlights in the scene, doesn’t happen if there’s only one.

Bump after another day, no one has an idea?