We invite you to check first if you have received multiple order confirmation emails with different order numbers. Please make sure that you did not used a different email during the checkout process or that it did not use an email linked to your payment method (Paypal, Apple pay..).
If only one order has been taken into account, this can be due to a computer bug.
It sometimes happens that the debit is initiated before the order is confirmed by the seller. When this happens and the order has not been placed, the amount is automatically credited back within ten days. We invite you to contact your bank for more information.