Getting dialog elements stacked in Firebug HTML tab on destroy... why?

Getting dialog elements stacked in Firebug HTML tab on destroy... why?

Building some custom widgets on top of jQuery UI, now when I try to destroy jQuery UI Dialog on top on which I have my widget, I see in FireBug that corresponding elements get stacked on top of html element.

I've attached a screenshot.


Is it how it is meant to be? Why?

I noticed similar behavior in the past with jQuery effects. Could not find a reason to it though, so I thought it was just my fault, of some kind.