这种情况可能与FedEx WooCommerce Shipping with Print Label. 您只需要以下免费附加组件和下面的代码。

隐藏基于装运类别和区域的WooCommerce装运方法跳过基于WooCommerce装运类别的装运计算，以及这些免费插件，下面的文档中已经很好地解释了类似的情况-WooCommerce Shipping – FedEx Live Rate Adjustment based on Shipping Classes.

下面是需要添加到函数中的代码。php文件。。。

/**
 * Snippet to Add an Additional Cost to the Shipping Service based on Shipping Class
 * Created on 28 March 2019
 * PluginHive Plugins: https://www.pluginhive.com/plugins/
**/

add_filter( \'woocommerce_package_rates\', \'adjustment_in_rates_of_product_with_shipping_class\', 12, 2 );

function adjustment_in_rates_of_product_with_shipping_class( $available_shipping_methods, $package ) {

   // Shipping class slug that need to add extra cost
    $shipping_class = array(
        \'other\',
    );

   // Give here Extra Cost you want add
    $extra_cost = 100;

    // Enter the Shipping Method Value
    $shipping_services = array(
       \'wf_shipping_ups:01\',
       \'wf_shipping_ups:02\',
       \'wf_shipping_ups:03\',
       \'wf_shipping_ups:07\',
       \'wf_shipping_ups:08\',
       \'wf_shipping_ups:11\',
       \'wf_shipping_ups:12\',
       \'wf_shipping_ups:13\',
       \'wf_shipping_ups:14\',
       \'wf_shipping_ups:59\',
       \'wf_shipping_ups:54\',
       \'wf_shipping_ups:65\',
       \'wf_shipping_ups:92\',
       \'wf_shipping_ups:93\',
       \'wf_shipping_ups:94\',
    );

    $shipping_class_exists = false;
    foreach(WC()->cart->get_cart_contents() as $key => $values) {
        if ( in_array($values[\'data\']->get_shipping_class() , $shipping_class) ) {
            $shipping_class_exists = true;
            break;
        }
    }

    if ($shipping_class_exists) {
        foreach ($available_shipping_methods as $key => $value) {
            if ( in_array($value->get_id() , $shipping_services) ) {
                $available_shipping_methods[$key]->cost += $extra_cost;
            }
        }
    }

    return $available_shipping_methods;
}