For child theme the file style.css is empty sir. Clear cache, delete historic navigation, wp rocket refresh cache, refresh page in navigation private mode ok, but again issue on product page… – There is a cache of some sort, because via inspector in the browser the next content of style.css file is visible – https://prnt.sc/Batt_ewY4so1 Do you use CDN or browser cache? Ask your hosting provider for assistance with it.
One standard license is valid only for 1 project. Running multiple projects on a single license is a copyright violation.