My client has been having a problem that has shown up twice now. On checkout, sometimes shipping is free and there is no charge being added. What we are seeing is this on the receipt when the products sold are being listed out:
Update Your Customer Information
Category: 1 $0.00 ($0.00 each)
They do a lot of volume in products and this shows up about once a month.
Is there some known issue that displays like this?