Reply To: checkout page isn’t go anywhere?

Hello,

Please make the full backup of your site and check the issue on the Storefront theme to detect if our theme causes the problem. Storefront is a free theme developed by WooСommerce.

If you see the same on the default page, make sure you have set the functional pages properly: https://woocommerce.com/document/woocommerce-pages/

Best Regards