Affix sticks to the top after going to the bottom

[ShaunR]

I'm thinking this is a bug but I could be wrong. I've got a test page up showing the issue that can be found at http://72.1.241.234/affix/

This is whats happening from what i can tell....

When scrolling down to the bottom affix will add a position:relative and a top: ##px style to the element. Then when you start to scroll back up top is removed but the position: relative is left behind. What ends up happening is that the affix element goes back to the top and affix no longer works.

When the affix element moves initially it's position is fixed and with that left over position: relative style it's taking over.

[mdo]

Dupe of #9342 I believe.