Go to Your Home Dashboard → System → Plugins and in plugin name Disable Font Awesome Loading, enable it and Its will AUTO work.

Before Active Disable Font Awesome Loading Joomla Plugin

Before Active Disable Font Awesome Loading Joomla Plugin
Before Active Disable Font Awesome Loading Joomla Plugin

After Active Disable Font Awesome Loading Joomla Plugin

After Active Disable Font Awesome Loading Joomla Plugin
After Active Disable Font Awesome Loading Joomla Plugin