Hello,

Your Checkout page is customized via Elementor: https://monosnap.com/file/0r0I1reHVHAQYZZw2JNjNan2ajhKcF , it is not right to do so, hence you should remove this page and create a new one in which you define the shortcode as in the below screenshot.

https://monosnap.com/file/yUUbu8aNhQ110EN88RJMdcVhamTyLa

Then you need to apply the new Checkout page via the settings of WooCommerce (more detail in the below screenshot).

https://monosnap.com/file/OMtdUStnjYLkAxKEX3u15gvrGosQ9k

After that, the Layouts will work well.

Kind Regards