That looks like a problem with Google Fonts – Given it is inside your browser this means this is occuring after the content is sent to your browser (i.e. it is nothing to do with WordPress or the website)
WordPress (your website) is sending data to your browser and then your browser is trying to get the font from Google and failing.
Try from another PC and another network.
You could be blacklisted by Google, your network could be blocking connections… Could be anything except WordPress.
