Knoxtane I have disabled the extension and cleared cache, they seem to appear properly now
Have you configured the FA 6 kit origin correctly? When fetching https://kit.fontawesome.com/9501bea102.js
at your forum, I get a “Not allowed when Origin missing” response in the networking tab, so I assume that you might be using a wrong origin domain for your kit somewhere in your https://fontawesome.com settings (I believe that it should be set to www.marathonhub.net)