Two toys getting picked up at once reading as one

Prize meter is faulty - change it

Prize sensor needs adjustment - watch video

On jumbo the chute is bigger so needs to be more sensitive

Direct sunlight down the chute can affect it

Dust build up can affect - vacuum or air compressor blow air on it

Dishonesty - machine being tipped

Human error in counting - check for a few weeks

Low skill players sending claw down the prize chute instead of play area

Round balls bouncing back up

Toy getting stuck in prize chute (possible)