It looks like a "tab-top" anchor has been removed from the user profile page. When you are in your profile and click on another tab (say, the "activity" tab), you get a link like
http://stackoverflow.com/users/18511?tab=activity#tab-top. However, there is no "tab-top" anchor on this page, so you are taken to the top of the page, rather than to the tabs section.
I think this is something that has broken fairly recently.
Bounty: As a 10k+ Meta user, I'm putting some of that + on the line to draw attention to one of my overlooked posts that should be trivial for the team to address. (Hey, it worked last time.)