[2020] Terrain keeps lowering

Can you grab some screenshots of what's happening? Your output log (player.log on Mac and Linux) would also be useful as we can see your mods and any errors in the game in that. This guide explains where to find it and suggests some sites you can upload it to, since we can't attach files here on Steam.

https://steamcommunity.com/sharedfiles/filedetails/?id=463645931&searchtext=log