Thanks for using our theme.
Please note that we do not give a guaranty for full theme compatibility with all existing 3rd party plugins. Sometimes, not always, you need additionally customize the theme or plugin to make them work together. Unfortunately, it’s not possible for the author to make the theme compatible with all the existing plugins and additional customization is outside the scope of our support.
1/ Try to disable Single Product Builder via Theme Options and check then.
2/ Provide FTP access, we will check what can be done to help you.