Thanks for the reply.
Please update the theme to 8.1.3 version and Core plugin to 4.1.3v.
Clear cache (including CDN cache) and check sidebar then.
If this does help, try to disable all the third-party plugins (including cache plugins), that do not come bundled with XStore https://xstore.helpscoutdocs.com/article/36-included-plugins , clear cache, and check then. Maybe one of the additional plugins is a reason for the problem.
Let us know the result. Dev team will back to work after the weekend, if the problem would be solved by that time, they will check the situation more deeply and will help you.
Regards