Built project on PC, openend on Mac now it's corrupt!

hello there!
i just built a VR project on windows and openend it on my mac. somthing was way off so i tried it again on windows and it seems that the whole project is visually broken. it seems as if all normals are flipped somehow.

it’s not that easy to describe so check out the screenshot that i did:

i deleted the intermediate folder but still no luck!

is there anybody out there with the same problem?
cheers.chris