This is likely due to the "Arimo" google font.

@nirik has a js blocking plugin that only allows stuff from *.fedoraproject.org. We should patch the odometer to somehow pull in a font that we provide instead of one from google. Ultimately, it is rude to ask our users to submit their web activity to google.

I'm seeing something similar now in Firefox (with JS enabled):

Ah, so I removed the Arimo font and the googlefonts reference and added Comfortaa instead, but it assumes that the user has Comfortaa installed on their system. We need to figure out how to make comfortaa available somewhere as a web font (anywhere will do, but the best would be to have it a part of the bootstrap-fedora theme that's getting copied around everywhere).