Thanks for letting me know about that, I'll be sure to fix the collision with those objects. When you say it occurs at the end of the dungeon, do you mean the end of the first section there, or at the very end in the boss room?
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Yeah it's usually north walls that do this. In the pictures you showed, the problem was that the banners I put on the wall were set so that the player could walk over them, which overrides the setting that says "no, you can't walk on these walls." It also happens if I don't put walls under the roof tiles, as by default you can walk onto ceiling tiles from below, for some reason.