estimated cost vs. estimated togal on shipment confirmation

We are new to ShipRush and are working with our customer in setting up and using Ship Rush.

We have an issue that we clearly see with UPS - we have a shipment marked as residential, the estimated cost comes at $10.68 - which is correct and but when we click on ship - the shipment confirmation comes back at $7.88.

I notice that in the ShipRush window - if i unmark the Residential box - the estimate cost is $7.88,

so it seems like the issue is when i click on Ship, it drops the residential flag.

I have seem as well in the FedEx Ship Rush window - the residential flag does not always seem to hold.