The "graphics" are generated using code. So it's a coding issue.
If you choose to use a third party tool, then you need to learn and figure out how that tool works. He posted what you need, and it pretty clearly explains how to fix it.
The problem is between your CDN and your server and the only way to fix it is by adding the code that matchs your server (Apache, Nginx, etc.). The solution doesn't require programming skills at all, just open a file, paste the code and done.
The icons are generated using sort of a hack that involves the use of a font that instead of numbers and letters it contains those icons. That's why the problem is strictly how your server communicates with your CDN.