During a custom hover over in a bar chart, I seem to get a 1px wiggle in the position/size of the popup box. It wiggles with every pixel move of the mouse within the single bar element. It's as if it is stuck between two sizes and each movement of the mouse causes the box to redraw with alternating sizes. (perhaps a rounding issue??)

The wiggle is causing the box and corresponding text to become blurry.

If I remove the custom hover function, this doesn't seem to be happening as often, although I can usually find 1 bar that will exhibit the same behavior.

Has anyone else noticed this?

Chrome on Windows 7