Try this:
Instead of giving a drag and drop behaviour to the blue shape, add this event and remove the "drag and drop" behaviour:
When mouse button is down: set "blue shape" position to mouse.x, mouse.y
Or, if you want to do it for mobile devices:
On touching screen : set "blue shape" position to touch.x, touch.y
Anyway tomorrow I'll be home raedy for fixing it if you will still need help these events are just a quick idea on how to fix that