1930's Antique Pace Slot Machine

I hit 3 bells and it paid 5 coins instead of 18. I have only hit that one time, so not sure if it was just once or an issue that always happens. The item "1930'S ANTIQUE PACE SLOT MACHINE" is in sale since Sunday, May 08, 2016. This item is in the category "Collectibles\Casino\Slots\Machines\Antique Coin Slot Machines". The seller is "dd331ek" and is located in Parma, Michigan. This item can't be shipped, the buyer must pick up the item.