Clear the WP Fastest page cache after making your changes. It is also possible that the browser is simply loading the locally cached version of the page instead of fetching it a new, usually due to how caching plugins set the page headers for the browser so it knows if it should cache locally or not. So, you might also have to force refresh the browser.
If have WP Fastest cache has the option, you can also reduce the cache lifetime. And, you should not enabled caching for logged in users (if it has that option). So many times I’ve helped other WP users (not Connections related) where they could not understand why changes were not being reflect because of that option. Likely why caching plugins which have such an option have it off by default.
Hope this helps!