The issue you are facing is because those products had been created using the page builder and now you are trying to change the description from the classic editor of WordPress which does not work.
You have to Install the Plugin page builder on your site that you used for the products and then allow the products to be edited with that particular page builder like showing below:
After that again go to Wp-Dashboard >> Products and edit the product using the page builder, change the description with the page builder, save changes and check back to your site after clearing the browser cache.
If the issue will persist then please share your site WP Admin URL and Credentials with me in the private content area of this topic, so that I’ll check it for you on your site and help you out.
Regards 8Themes Team.
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