I've been having some difficulty with magic rune traps appearing either on the wrong side of the room or, if positioned on the floor sometimes they appear on the ceiling when I go in-game.

Any idea what might be causing this? I've tried adjusting to make the rune object flush, embedded and raised a bit from the surface, but it doesn't seem to fix it.

Mystery solved!

The arrow in the rune trap object must be pointing toward the surface, not away from the surface.