Thank you for writing in, You’re having a Cross-Origin Resource Sharing (CORS) issue. That means this URL
http://56x.e48.myftpupload.com is blocking the resources coming from your CDN
http://secureservercdn.net/18.104.22.168/56x.e48.myftpupload.com yes even if they’re referring to the same site. Basically, your site is blocking its own resources (FontAwesome) that is why the icons are not showing up.
Please access your .htaccess file via FTP and add the lines below.
Header add Access-Control-Allow-Origin: http://secureservercdn.net
Header add Access-Control-Allow-Headers "origin, x-requested-with, content-type"
Header add Access-Control-Allow-Methods "PUT, GET, POST, DELETE, OPTIONS"
Troubleshooting - Font Awesome
Let us know how it goes,