My casern is bugged

what s the problem?

i optimized my game with Nvidia and i have a RTX2060 ,intet core i5-6600k ,16Go RAM.
i only have this bug with casern no other building
when my setting is on minimum this not happened but i dont want to play like that…

Wow! That’s…something!

Curious if you saw this again, or just one time?