I was just looking at my profile and noticed the member badge section was pointing to 127.0.0.1. I followed the "member badge" link (the page that shows you all the options for member badges), and I found the 127.0.0.1 link there too.
Here's some screenshots:
..i clicked my member badge while on my local dev machine. Is that where this could be from? I mean, I also clicked my badge from my real site just to see if it would change anything, but it wouldn't. Page refreshes didn't help either. I'm not in it for the linkback, it just looks broken to me.