Hi
My Character blueprint is still about 3 units above the floor (its capsule half height is 50 and if I spawn it 50 units above the floor its Z location changes to 53.15 automatically after starting the game). This is a big problem for my game.
The same problem is in Third person blueprint template:
You will need to adjust the size of the capsule radius and half height as well as the scale of ball character until the results are what you like. You can enable seeing the collision in the Viewport settings, that way you could see exactly what is colliding.