Hello, experiencing similar issues on my PC, all browsers. I had read that FontAwesome has had issues at times with certain ISPs globally, but using my macbook on the same network loads the icons just fine (I live in Hong Kong, with Smartone as ISP).
Inspecting the network console in chrome on my PC, I get this error at line 157 of udan-tracker>view :
< GET https://fa-proxy.world-anvil.workers.dev/ net::ERR_CONNECTION_REFUSED >
And a set of similar errors later on trying to load certain typefaces of Lato that I can also provide if that's helpful info!