Weird shapes appearing and game freezing on loading a hill.

[Bartosz Pawluczak]

So basically im making a dsj4 replica of a hill that im gonna be making irl and sometimes when i turn the hill on some weird shapes appear. Sometimes its like a yellow or green sqaure on top of the inrun or multiple big white rectangles flying all over the place. Also sometimes when i load the hill the game just freezes on loading and i cant leave the dsj window. Can anybody tell me why is that?

[Bartosz Pawluczak]

..........

[Bartosz Pawluczak]

Example: https://imgur.com/a/mMtyT9X