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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Interesting. I am using Firefox with a mouse on a reasonably similar machine and I don't see the same issue. Does scrolling work the way you think it should on other sites? If so, can you hit f12 to pull up the console and see if there are errors on page load or anything?