Popover does not get anchored to the triggering element

Parent element (offsetParent) of popover need to not be static, you could postionned it relatively to document:

position: relative;

See jsFiddle

EDIT: for your use case, you could bind onscroll event of container and use following snippet:

SEE jsFiddle

$(function () {
    $('#example').popover();
    $('div').on('scroll', function () {
        var $container = $(this);
        $(this).find('.popover').each(function () {
            $(this).css({
                top:  - $container.scrollTop()
            });
        });
    });
});