Hello, @aminec,
Thanks for the login, I have checked your issue on your site. I checked all the options and it seems that everything is set to fine. But the issue still appears.
Then I created a new product and set the description of it and once I saved it, I checked on the frontend the product appears just fine and there is no issue.
Tabs content works fine. Check this video I have made for you: https://streamable.com/vj3y4o
The issue is in the products nothing else. Simply Delete those products and create new products I hope you will never face this issue again.
Regards 8Themes Team.