Your bank account, or credit card, will be double charged. It is the doings of Swanson, not your bank since you probably know already not to go negative without problems. Your account might charge daily overdraft fees if you don't figure on that policy. There are other sources that don't do that. The second charge drops off, but possibly too late. Prices are average. If a credit card is overdrafted past the monthly statement date they might have to turn it in to your credit report.
Hi there, Jim! We've recently updated our payment processes to ensure there are not duplicate charges when an update is made to an order. So sorry to hear that you were impacted by this old process, but happy to say it has been resolved!