Fruit Machine Chat

Hi all, I have recently bought a DOND Crazy Chair fruit machine which isn't working as it should. The main feature seems to show an offer amount of £222 and not £70. When you get onto the top board and start knocking out the numbers on the right side (red) they seem to change to £22 and not just disappear. Sometime an offer will come up with £21.57 for example but when you collect it might be only be £9.

Has anyone very seen this before? I would really appreciate any help you can offer.

Thanks