Might have been too complex to move country outlines with a drag as it recalculates the size of the outline depending on where in the world it is. You can see it 'refreshing' the outline when you move it using the arrows.
Outlines - not a problem...
http://bramus.github.io/mercator-puzzle-redux/
(based on the original https://gmaps-samples.googlecode.com/svn/trunk/poly/puzzledrag.html )
The source is available so a draggable version of any country should be simple enough...