I have the USPS Shipping Module installed on a 1.51 site. It caculates the shipping prices correctly and everything works well Together. I set up an account as a customer to test and it worked fine up until the payment section. I selected the cheapest shipping option offered which was about $31. But when I go to the next page for check out the shipping rate has no changed to the most expensvie overnight shipping at $138. Obviously the numbers are not needed, that was just an example of the issue.

The site can be found here:
http://bayareapkgstore.com/

I can not figure out what is causing this issue. Any help would be greatly appreciated.