Hello Nina,
Thanks for writing in! Since you have installed a caching plugin WP Fastest Cache, please clear your plugin cache before testing your site. This can cause the changes to not take place on the front end. It will eventually show up when the cache regenerates, but it’s not ideal if you’re looking to see your changes immediately. Caching plugins are best to turn on only when you’ve finished building the site.
Meanwhile, X 7.1.2 and Cornerstone 4.1.2 are now available in automatic updates! This release contains fixes for several issues so be sure to check out the changelog (http://theme.co/changelog/). Please do update to the latest version. After doing the updates, always remember to clear all caches (if you are using WP Rocket, WP SuperCache or W3 Total Cache) when updating so that the code from the latest release is always in use. This will help you to avoid any potential errors.
Please let us know how it goes.