Floor Freaking Out?

I’m having a weird issue where I just placed a building, and the floor is freaking out and slicing between the floor and the grass below. It looks awful! How do I fix this?
https://steamcommunity.com/id/sheifoxy/screenshot/961970384075469242

did you use instant build? or is this just the blueprint?

Yeah… I just read that IB can cause it.