Hello,
1/ Make sure you are using the latest version (8.2.3) of the theme (it is not recommended to update Core before the theme update).
2/ 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 a reason for the problem.
Regards