Steps to reproduce:
1. Open link fiddle
2. click on popover button.
3. popover appears, drag this to the bottom till vertical scroll bar appears.
4. drag down the vertical scroll bar than popover will go back under the button.
5. click again button, the popover will disappear.
6. Click again on button, the popover will appear to the location where the user left it earlier.
when a user drags down vertical scroll bar, popover should not go under the button rather stays there exactly where it is left.