sphere gets into cube

Hello guys

I have a cube with a collider acting as a table and a ball that falls in that table, i want the ball to bounce in the table, but i noticed that the ball gets into the table, it bounces, but i looks weird. I don't know if the colliders are failing or whats happening, if you could help me, i'll be really grateful. There is an image as attachment to show you what the ball does

Thanks