Character hangs on the end of colliders?

So I'm using a rigid body i have a staircase the leads on to an untextured block right now when i get on the edges of the box my characters hangs on to the side rather than just falling. My character will fall off if i keep pressing but how do i make him slip off instead of this unrealistic hanging? By the way if I shorten the collider enough to get my desired results i get clipping into the mesh since that part isnt covered with a collider any ideas?