Short description formatting disapeared

Hello, I am using the Furnitrix Theme which I am quitte happy about. But now I have an isssue on my product page : https://thelemerealtennis.com/en/product/raquette-margot/ 2 days ago I noticed that my products where not showing up anymore. It was coming from the theme (I've desactivated all plugin, still not working // changed theme, working again). By working around, I figured that my "single product page" needed now to be used with blocks to display product again. After I did that my product where showing up, but the "brief summary" of the product was not showing up with any formating, although I've putted formatting in the product editing back-office. Are you aware of why the non block page was not working anymore ? Anyway to put it back working ? Otherwise any idea of how to get formatting in the "short description section" ? Thanks