Could you be more specific about the problem? Also, what platform are you on?
Loook at the vid. It's pretty obvious.

It's been annoying me aswell. You look over an edge, your arrow should have plenty of room to fly over it, but ack! it sticks. The same happens on some types of stairs and ramps.
No solution?

There is no easy player-fix to it. Bethesda needs to update the meshes. (Or some modder might want to do it if Beth doesn't.)