Are they in the Items list or the Snacks list? This is quite a common glitch. Don't feed your Tamagotchi the balls if they are in the Snacks list, it could freeze your TamaScreen. Delete them from the list by going to the last icon, Present, choose each one, press B, you will see a thing that says Wrap?, then press A and it will say Trash?. They Press B to delete it. Repeat for each ball.