See, this is another thing broken in the current web. I made a usercss (Stylus) to normalize font size for certain elements and it works reasonably well. But on this site, it looks like this.
Anyone has a guess why, something with viewport or other meta tags?
Edit: fixed, they use a custom font with weird size settings. Looks like this now (with my normalize usercss).
As a web dev we do try to accommodate userCSS for accessibility reasons but often font sizes are tuned to what they are for a reason. I'd guess there's a line height issue here.