The specific reasons are as follows.

1. Generally, the cost of the same order is deducted from the total amount in one go. The total amount includes the product selling price, shipping and packaging fees, and taxes (consumption tax and import duty deposit). 2. There are exceptions, that is, when there is an out-of-stock item in your order, Amazon will automatically split the out-of-stock item into another order and turn it into a "wish list", and the order will not be required to pay. When the "wishlist" item arrives, Amazon will send you an email to remind you that the item is available.