So I was browsing around Careers today and came upon this glorious bug:

Almost as good as double rainbows, but not really.

To reproduce:

1. Go to your favorites page (http://careers.stackoverflow.com/jobs/favorites)

2. Click the "Your Favorites (xx)" link in the right column:

   

3. You should now have double headers.

I've also made a bug reproduction screencast at Screencast.com.

I can reproduce in Chrome / Firefox on OSX 10.8.