Can some one help me identify these edge lines So my problem is that i was making a low poly house and part of my workflow is to use the solidify modifier but after i applied it when i go and select or look at certain lines they very thick and also when i select one it goes black yellow-orange (or white) then black, its hard to discrib buts here's a image.



Help is much appreciated.
Never mind, it's a crease i think, though i don't know if it should be there.