Shopify Package Weight Not Coming Over to ShipRush

Hello,
I'm using the FedEx ShipRush integration with Shopify. I have all of my product weights in Shopify, along with the Packaging dimensions and packaging weight.

However, when the data for an order is pushed to ShipRush, it is including ONLY the product weight, and not including the weight of the packaging. How do I get the weight of the packaging to come over?

When I use the FedEx integration to do real-time quote pricing for the delivery options, the packaging weight is included. Why isn't it making its way to ShipRush?

Thanks