When displaying your checkout rates in Shopify, the rates only display the lowest option not all the options. So for instance, USPS Priority Mail and UPS Ground are basically the same and yet it only displays USPS Ground because it is cheaper. But our customers have stated that they have no confidence in the USPS and would prefer UPS. Also, UPS provides insurance and more of a guarantee on their packages.
We really need a way to display all the options not just the lowest priced option. So unfortunately this feature is useless to us. and we must use Shopify and have discrepancies.