Name and screen name in profile are different sizes
This is a bit of a regression from who knows when, probably when tweaking the user cards in follow/follower lists.
Right now the name in your profile is 14px, and your screenname is 15px, they should both be 15px.
Whoever grabs this issue make sure to investigate how badly overlapping the styles are, you might end up breaking stuff elsewhere if just simply changing the style in one place. That's how it got broken in the first place I believe.