Never noticed this before, but I’m having a really wierd issue with PIE instances in my MP game. Shadows seem to be shared / duplicated depending on the active game instance. Can’t figure out why! Video below:
This may be related to UE-32539, which seems to have since been resolved. When I get around to porting to 4.14, I’ll update this.
Let me know if upgrading fixes the issue for you, as that does sound like the same thing that you’re experiencing in your project and what I saw in the video as well.