Why? Shouldn't they stay the same on 2D UI? Makes no sence in my opinion to move collider off the sprite. And the box colliders frame does not seem to be actually offsetted, and regular raycasting hits the box just fine. Offsettig z-value would make sense, but all colliders seem to be off about the same amount downwards, doesn't matter what the depth value is, happens with 0, 1, -1 etc all the same.