USPS Shipping rates – higher than expected

Hello – I am using the WooCommerce shipping plugin for my USPS shipments. I have set up a box and I see that for the item I have in my cart, the correct box is chosen and USPS Ground Advantage was applied as I expected per my configuration. However, the price is higher than my usual cost for this type of box with Ground Advantage my response below from adding an address. Usually I see about 6.30. Is there some other setup I am missing?

"shipping_rates": [
                    {
                      "rate_id": "usps:8:D_GROUND_ADVANTAGE",
                      "name": "Ground Advantage™ (USPS)",
                      "description": "",
                      "delivery_time": "",
                      "price": "1200",
                      "taxes": "0",
                      "instance_id": 8,
                      "method_id": "usps",
                      "meta_data": [
                          {
                            "key": "Package 1",
                            "value": "USPS Ground Advantage® - 9 \u00d7 6 \u00d7 3 (in) 2.21lbs"

                           },
                           {
                            "key": "_package_length",
                            "value": "{\"Package 1\":\"9\"}"
                           },
                           {
                             "key": "_package_width",
                             "value": "{\"Package 1\":\"6\"}"
                           },
                           {
                             "key": "_package_height",
                             "value": "{\"Package 1\":\"3\"}"
                           },
                           {
                             "key": "_package_weight",
                             "value": "{\"Package 1\":\"2.21123386\"}"
                           }
                       ],
                       "selected": true,
                       "currency_code": "USD",
                       "currency_symbol": "$",
                       "currency_minor_unit": 2,
                       "currency_decimal_separator": ".",
                       "currency_thousand_separator": ",",
                       "currency_prefix": "$",
                       "currency_suffix": ""
                  }
         ]