I think this is related to, or the evolution of, Tag name overflow on "top tags" section of user profile if tag name is long, but I don't think they're dupes as this one had the tags overlapping each other, but this (updated?) bug has them push the border away.
This user only has three top tags, all three of them having rather long names; as a result, their profile page is broken. Same thing for two other users who answered that question (and have no other tags): Nic and Hayden.
I don't think it's Skynet trying to wreck SFF, as I found another instance on Movies.SE (also related to time travel, though...). Namely, Aparajit Basu:
Steps to repoduce:
- search for questions with several long tags. On SFF we have a lot of those, with the franchise tags, same on Movies; I wouldn't know for other sites.
- specifically, search for posts likely to be from passing-by users:
[long-tag-1] [long-tag-2] score:..xwith x depending on your site's voting habits. For Movies and SFF I had x=3, once again no ideas about other sites.
- select posters whose names you don't recognize as frequent users, and check if they only have 3 top tags and if the problem reproduces.
I'm on Windows 10, Firefox 64.0.2.