Your problem is that you want to use 2 methods at the same time. You either use the collision deformer only or the dynamics.
For a cartoony simple look I would go with the collision deformer and delete the dynamic tags. Then set the collision mode to "outside (volume)"
Or if you are looking for a realistic look delete the collision deformer, reduce the segments of the sphere to something like 36, change its type to hexahedron. Then to make the ball not go totally flat you go to the soft body settings and change the stiffness to something like 10 (more or less depending on what you are after).
And as this method is a simulation, you have to insert a floor, either a floor object or any shape just make it simple then add a collider tag to it.