the problem is that the triggers for the various shipping options have been re written incorrectly.
edit the cart object again and set the trigger for the USPS shipping rule to Number of unique items in the cart > 0
Your friends over here at WebAssist! These Dreamweaver extensions will assist you in building unlimited, custom websites.
These out-of-the-box solutions provide you proven, tested applications that can be up and running now. Build a store, a gallery, or a web-based email solution.