I just made a sale in which the customer opted for UPS 2nd Day Air. The cart billed her $19.61, but the actual cost was $60. The weights assigned to the products were accurate.
Any ideas what went wrong? I have disabled that shipping option, but wonder if anyone else has had similar problems. In the meantime, we will just go with UPS ground and USPS Priority and Parcel options.
We don't sell pacemakers, so most people should be able to wait.