Hello,
Please do next tests:
1/ 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 the cache of the browser, and check then. Maybe one of the additional plugins is the reason for the problem.
2/ check how it works when the parent theme is activated, to make sure that the problem is not caused by custom changes in child theme files.
Regards