How to make draggable buttons

What I mean by not staying true. After I create the drag/drop using the quiz wizard, I can take any piece and drop it to any of the puzzle shapes. They don't stay true to their assigned possition.What I mean by not staying true. After I create the drag/drop using the quiz wizard, I can take any piece and drop it to any of the puzzle shapes. They don't stay true to their assigned possition.

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