Just had to check mine. thankfully was not double charged.
So I did a bit more prodding and got the full story I think.
They went to a ticket booth to upgrade an AP on the final day of the ticket. Everything went smooth, until payment time. They said the terminal said approved and they instantly got a notification from the bank that the transaction was processed. The CM then told them that the screen popped up a message saying to contact a supervisor.
Said supervisor came over and said that the transaction didn’t go through at all and their bank had most likely blocked it for fraud. Then after paying a second time they noticed two pending charges and the supervisor had to manually void the first charge. To which they got told “up to 10 business days” for a refund.
They then went to Guest Relations to ask about it and try to get the refund quicker. GR then dismissed the issue and said there was nothing they can do about it and that “these thing just happen some times.”