Using same top and bottom boundary creates visual distortion

[fnarbona]

If the top and bottom boundaries are the same then when you get to the bottom and want to scroll back to the top, it sticky will stay stuck to the bottom and essential scroll out of view as you return to the top. I assume it has to do with the top and bottom boundaries being the same name. The nav isn't as large as the content it scrolls with, and although it's redundant to use the same name for top and bottom (given a fixed height to account for the header could be applied), I figured maybe someone could use this scenario.