Nvm, when i disconnected out of the VPN to my workplace, the images loaded fine.
Tried connecting to VPN again to test if the images would load this time, it didn't. Weird... It could be something specific with my VPN.
You should check out your workplace's firewall rules. About a week ago, my works' firewall suddenly started blocking the domain where Github's CSS/JS files were hosted and all formatting and images were gone. Not sure if Github switched hosting servers or our firewall whitelist was updated incorrectly.