I am definitely having problems with this as well. For me, it is the way that USPS shipping costs are being calculated. There is no way that I can find to tell the plugin that the items that are in the cart will be shipped in the same package, instead of mailed out individually.
The program is calculating the shipping for 1 item at $2.12 (3.3 oz for first class) and then just multiplying this shipping cost for every item in the cart.
What I need is to be able to calculate the shipping for the entire cart instead of each item individually.
https://www.thecorkcaddy.com