Your order may have been "pre-authorised" for your purchase. A "pre-authorisation" payment is done before completing an order to ensure funds are available, no money is actually taken from your account however in some circumstances this authorisation may show on a bank statement.
If inventory sells out before you complete an order (as is common with limited releases), our payment gateway will automatically void these "pre-authorised" payments, however, depending on how quickly your banking institution can process the void, it can take up to 10 working days for this authorisation to disappear from a bank statement.