Hello,
Try to disable all the third-party plugins (including cache plugins and CDN), that do not come bundled with XStore https://xstore.helpscoutdocs.com/article/36-included-plugins , clear cache of browser/server, and check then. Maybe one of the additional plugins is a reason for the problem.
Let us know the result. Provide temporary wp-admin and FTP access, so we can take a closer look.
Regards