Problem with Sphere and Floor?

I have a scene with a sphere that is controlled by tilting the floor underneath it (physics). It is supposed to go through a maze. When I play the scene everything works out fine until my sphere reaches the top wall. then it just sinks halfway into the floor. How can I make it so it doesn’t sink. I’ve attached two pictures to this thread, one of how it looks when the scene starts and one when the problem occurs.

Please Help.

What is the size / scale of the sphere?

It is 3.423208 on all axis.