So, I've checked, and this isn't a bug.
This user set a bunch of combining characters in their location field (where users are supposed to enter their 'location') themselves. Like I said in the comments, they're known to be fond of these characters (See the revision history of this deleted answer in the formatting sandbox).
For now, this is just confusing, and it doesn't seem to be breaking anything. I've asked around, and this is one of those things moderators generally don't intervene with, so I'm not going to reset the location field/profile.
