Hi, at some point recently a "gray mystery circle" appeared in my design that I can't directly select or apparently do anything with, plus my pointer has a circle with angled walls(?) off of it. The mystery circle is gray and located by stairs and its underlying wall, though I don't know if they are related. I have attached a picture that shows both side by side. Does anyone have any idea what these are, and how I can get rid of them?
Thank you for any guidance!