I really have no idea what this could be, but whenever I use my laptop's touch-scroll feature (2 fingers on the track-pad swiping down) Bnet gets all choppy and jumps down too far. My scrolling works fine on any other website.
Windows 7 64 HP G6.
Firefox with adblock disabled for Bnet.
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It's been that way for quite a while. I see it whether I use the pad or the mouse.