Hello, @Manuel Rivas,
The issue could be because of any third-party plugin conflict, Try to disable all the third-party plugins (including cache plugins), that does 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.
And if the issue will still persists then kindly take a complete backup of your site first.
And I also need your permission to debug your site, which includes deactivating all the third-party plugins and on-site Customization as well.
Regards 8Themes Team.