What happened at this ATM? Help please?

I used an ATM at a gas station today and tried to withdraw $60. It didn't give me the money, and I got a receipt saying that I asked for $60 but no money was sent out of the machine. I check my balance online and see that the $60 was added to the account. I had around 309$ and it shot up to a little over $360. I then withdrew 20 no prob and the amount I had was down to 342. When I went to get a statement from the ATM, it said I had $ 283. I'm confused, and I'm considering just withdrawing all the money since the card will never see an increase? What happened to the money? Help please? Thank you?