Problem With Down State not Clearing

Hi Matthew, I think you've found a bug there. As you say, when the mouse remains over the drag element as it returns back to it's origin, the down state remains. I would recommend reporting this issue. It looks like the mouse being over the object (and the hover state?) confuses whatever functionality is used to reset the state.

It doesn't look like there are any triggers you can add to reset the state in that circumstance as well.