I have a model of a Opel Blitz: Maultier and im facing a problem, the meshes or something seem to be duplicated or somehow bugging in a weird way. Quick clip: Video
Same problem in 3ds Max 2020, if somebody wants the files i can provide them if needed.
i already tried to remove materials and i tried to see if i can do something with the meshes but no luck.. didn't find a way.
From the video, this seems like a Z-Fighting issue: https://en.wikipedia.org/wiki/Z-fighting
However, it is hard to know exactly what is the issue without looking at the model. I could look more into it if you share the 3ds Max file.