"Now, when I move the cursor off the scrollbar and move it toward the link (or document) the scrollbar will 'jump' back to the top of the results page..."
Do you think that you may be inadvertently brushing the trackpad with your hand or wrist? If you're sure that's not what's happening then perhaps it's a "characteristic" of the trackpad so go to Control Panel -> Mouse and go into the trackpad settings. Turn off all the "special" features, especially those that control scrolling. I helped a chap a while back with a similar problem to yours and those tweaks worked for him.