Glitch and distortion after packaging

Hi,
I’m having a problem with packaging.

In UE4 editor the game looks perfectly fine

but when I export it, it becomes a huge mess.

I think it’s only affecting the tiles because cars and pickups stay unaffected.

Tiles are BP actors, buildings and the road are all in one mesh
(one of the tiles) Imgur: The magic of the Internet

Thanks in advance