If you have "Header 1" and "Header 2", and have scrolled down so Header 2 is stuck to the top of the screen, when you scroll back up to the point where Header 1 displaces it, the "Header 2" text will briefly flicker to read "Header 1" and then back again.
If you have "Header 1" and "Header 2", and have scrolled down so Header 2 is stuck to the top of the screen, when you scroll back up to the point where Header 1 displaces it, the "Header 2" text will briefly flicker to read "Header 1" and then back again.