A ball that has one flat side can land on two sides: the round side and the flat side. You can easily verify this by cutting an apple in half and putting one half flat side down and the other flat side up.
Note: the GP comment didn't include the word "weighted" when I made my comment, their edit makes this comment look like nonsense.
Note: the GP comment didn't include the word "weighted" when I made my comment, their edit makes this comment look like nonsense.