Please make sure that you have enabled the option “Single Product Builder” under (Theme Options > WooCommerce > Single product builder) as shown in this screenshot: https://postimg.cc/62KKtwhY
And if yes then please contact your hosting provider and ask to flush the server cache and turn it OFF for a while till you are in the development process: https://postimg.cc/dLLbMLYJ
And if the issue will still persists then please share the small video clip of your issue, and your site URL and Admin Login details in a private content area so that we will check it for you on your site and further help you out.
Regards 8Themes Team.
One standard license is valid only for 1 project. Running multiple projects on a single license is a copyright violation.