stackable-modal-open class remains on the body tag after dialog is closed

[mattcollier]

When a stackable is closed properly, it decrements the counter stored in body.data('stackable'). If the popover menu is not closed before the parent modal, the stackable counter is not decremented and the count is forever one greater than it should be. This has a cumulative effect as well if additional popovers are not closed properly. Of course the count is reset on a page refresh.