I've noticed this problem, too. I think it happens specifically when you drag an icon over the center button.
Also, on a related note, a possible change to the program: a setting that freezes all icons at their locations? i.e. they cannot be dragged to different spots. As it is, if I try to click something while my mouse is on the move the icon gets dragged a bit (it resets) and whatever I wanted to open doesn't get opened. Would it be possible to add a setting that would fix the dragging issue?