User blog comment:DaNASCAT/Technical Update: September 11, 2012/@comment-3153244-20120915123209

I've already reported this to Special:Contact:

When I visit someone else's userpage, I see my own badges there. This has been mentioned by a couple of users on my wiki as well, so I know it's not just me. I have also checked that this happens on all wikis with badges enabled.