I just recently completed the final tier of the Vending Maniac Achievement(finally!) when I got a triple-notification for the event. I thought it was just an appearance glitch at first that wouldn't do anything account-wise, but then a look at my inventory later I found 3 Miniature Vending Machines. I'm doubting that the achievement came with 3 machines but I wanted to confirm first. If it's not supposed to, should I report it as a bug or is it something they're aware of?

I'm pretty sure it's only 1 vending machine. I'd file a ticket.