The amount is debited when your item is dispatched, which normally happens 2-5 working days after ordering. Until then the amount can be reserved in your bank, depending on the type of card you used to pay for your order.
Dankort payments do not make any reservations on your account and are debited directly from the account only when the item is dispatched.
MasterCard and VISA payments normally reserve the amount on your account for the payment and the amount itself will then be withdrawn and the reservation cancelled when we have dispatched the item. However, there may well be some extra processing time on these card types, and it is for this reason that the amounts are listed as reserved with your bank.
If you choose to pay by other means, such as Viabill, you will have to pay the amount to them by agreement.