All Orders in Last Week In "Pending" Status

We recently ran out of FBA inventory but a large number of our units shipped to Amazon have been received and have an FC transfer or FC processing status. This has enabled our listing to stay open and customers to continue buying our product despite us having 0 FBA available inventory. However, during this time, every single order placed in the last week is in a "pending -- awaiting payment verification" state.

I find it hard to believe that coincidentally Amazon is having trouble verifying payment from every single (over 100) unique customers of ours beginning around a week ago.

Is it possible that Amazon is not charging the customer's payment method for the purchase until the units currently all reserved under "FC Transfer" or "FC Processing" become available for shipment to fulfill the order?