Dianataha Hi again, thanks for enabeling it again. I see what's going on. Currently, your WordPress theme is using FontAwesome 4.7 (a version from 2017).
Buttonizer automatically selects FontAwesome v5 when installing. Fortunately, Buttonizer supports FontAwesome 4.7 too and we have a setting to manually change the version.
Go to Buttonizer settings and go to the
Icon library settings. Then select
FontAwesome version 4.7. You can disable the
Import icon library as your theme is already doing that for you.
After changing the icon library version, you'll need to reselect the previously selected icons in Buttonizer as their 'classname' have changed in version 5.
This should do the trick! Let me know if this helps 🙂