When expanding on our first area of the environment, we copied the first terrain and edited to fit.

when building the scene these shadows show up. Anyone had/seen this problem?

i'm probably wrong, but sometimes i have thos shadows when i have 2 same terrain on top of each other overlapping themselves.

Yeah I know what you're talking about, but these aren't overlapping. They're just duplicate terrains edited slightly, not sure if them being copies of each other has anything to do with it.