Hello There,
Thanks for writing in! I’d recommend that you clear your caching plugin, WP Fastest Cache and disable it during development. This can cause Customizer 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.
Hope this helps. Kindly let us know.