Thanks for using our theme.
We do not have this issue on our test sites and do not get reports from other customers.
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 a reason for the problem.
2/ Contact your hosting provider and ask to check it from their side.
Let us know the results