Hello,

Try to enable the Shop/Checkout templates from theme instead of Gutenberg, you need to edit those pages and remove all Gutenberg blocks (https://monosnap.com/file/DYynCYO5DELtMiDQW2E99Yhx3TFPCs). Then define such shortcode for the checkout: https://take.ms/8yG9B , and for the Cart: https://take.ms/1bnqH , then those pages will be shown with the theme’s design.

https://woo.com/document/woocommerce-shortcodes/

Then recheck the issue.

Kind Regards