Hello,
Thanks for the reply.
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 of browser, and check then. Maybe one of the additional plugins is a reason for the problem.
If this doesn’t help, provide FTP access to the staging site, I will ask one of our dev to check the problem more deeply.
Regards