USPS not calculating shipping rate based on weight of total order

Hello all…

I have set up a Webflow ecommerce product page for a client with FedEx and USPS, weight-based shipping calculation. The FedEx calculation works fine, but the USPS does not calculate the total weight, no matter the quantity ordered. Only the lowest shipping cost in the USPS cost settings is applied. I’ve searched quite a bit, but haven’t yet resolved the issue. Has anyone else experienced this same issue, and found a solution? I appreciate any thoughts you might have, thanks.

Here is my site Read-Only: Webflow - Entrusted Study Programs]