WooCommerce USPS Shipping Issue

Hello,

I am having a weird issue with my USPS plugin for WooCommerce that I can’t seem to figure out. With a couple of sites that I run, there is a hiccup with certain products that when a variable is selected on the product page, USPS will not show up in shipping when added to the cart. Some products will show it fine and then others won’t. I double checked that there were weights and dimensions on the products and have my USPS and UPS plugins connected with the WooThemes Helper plugin for up to date plugin updates. Any ideas as to why this would be doing this would be really helpful.

Thanks