Auction Chocobo Fix

Have you done any event work where the 'nibble' as it's called was adjusted in some way? The nibble is used for having sprites/objects go in front of or behind map layers, and if it is not set back to default that would happen. If not that, maybe the tiles in question had their properties altered somehow by accident or some patch? Or maybe the emulator settings file got corrupted I remember some rare issue with that causing visual glitchyness and erasing it so it could create a new clean settings file fixed it up. This doesn't sound like such a case but it won't hurt to try.