You should deactivate all plugins (except Required Plugins), clear all browser cache and then reactivate them one by one. This makes it very easy to isolate the plugin causing problems.
You are using WooCommerce Blocks https://prnt.sc/34eO513qHyg4. You need to remove them completely – https://monosnap.com/file/DYynCYO5DELtMiDQW2E99Yhx3TFPCs. Then define the Shortcode element with [woocommerce_cart], save the page and as a result, the default template for Cart page will be shown. The same goes for the Checkout page.