ProMods

I've got strange bug on my map of Ukraine, that I'm building:
https://www.youtube.com/watch?v=HOKbtnmnWbQ
The same bug is in game on test profile(created automaticaly using Run map)

Well, do you see this yellow line when you're in top-view?
It's called a cutplane and you can see what happens when you go through it

Yeah, thank you, it works now.