Hovering over sparkline charts can sometimes not show the tooltips on IE11

[She-Ravolo]

This happens only when I use IE11- when I hover over the sparkline charts, it sometimes not show the tooltip. I've tried to hover over the chart from the left/right side and it doesn't seem to affect in any way.

[chillyistkult]

I can reproduce this behaviour on Chrome 44.0.2403. If you move your mouse from the left side into the chart it's not working. From all other directions (bottom-up, top-down, right-left) it's working properly.

[bi-kai]

@chillyistkult same to me, any idea to solve it?
examples on official site, also has this problem.