Overlapping way borders in two different areas of the scene, or like a stray point that made a side of the border overlap with another side?
(If that made any sense
EDIT: Also, does it make sense that the error would persist even after I delete the (only) scene?(!)
I guess I can try making a new scene with more open way borders and see if that works...
My way borders are pretty tight, as I am making a sidescrolling game.