Hello,
Thank you for reaching out to us.
1/ We recommend that you disable all third-party plugins that are not included with XStore (https://www.8theme.com/documentation/xstore/plugins/included-plugins/). After doing so, please clear your browser’s cache and check again. It is possible that one of these additional plugins is causing the issue.
If the problem persists, we suggest switching to the Parent theme if you are currently using the Child Theme on your site. After clearing the cache, check again.
Let us know the results.
2/ Please enable debug mode in WordPress – https://wordpress.org/support/article/debugging-in-wordpress/ to find out what error appears on your site, it will point you in the right direction and what needs to be fixed.
Warm Regards,
The 8Theme Team