I also faced the same problem, I have subscribed to a profile on OnlyFans and I was charged $5 over 3 times. Firstly I thought that OnlyFans is doing scam but after 2 days the extra amount which was charged was refunded to my bank account.
This thing happens and may appear on your bank statement as they may not get successful when you are doing your first transaction on OnlyFans.
Banks usually reserve funds for a transaction during the process that’s called Authorization Hold. Since such transactions fail to complete, this authorization hold is usually unblocked from your card automatically within couple of days.
If you are not getting the refund of your money after 72 hr then you must contact OnlyFans customer care service.