Hello,
Check your shipping settings: Make sure that you have set up your shipping options correctly in your WordPress dashboard. Go to WooCommerce > Settings > Shipping.
Please follow this Guide: https://woocommerce.com/document/setting-up-shipping-zones/
If the issue remains, Please check how it works with the default WordPress theme and Woocommerce Storefront theme just to check whether the issue is with our theme or not. Also, please check the site with our theme but only with the theme default plugins activate, and deactivate all the 3rd party plugins from the site.
Best Regards,