hello @Tina538
Have you cross referenced all your transaction records both via when bookings have been made and in the Transaction history?
Occasionally there may be a discrepancy with exchange rates and I do recall there was discussions about an adjustment payment of small amounts credited to accounts so maybe you need to see if that's what it may be.
If it's that that should show up in your bank records
You may like to use related keywords to see what discussions took place at the time.
All the best