Drag and Drop Misbehavior?

Hi all... David Fair's tutorial on D&D quiz questions indicates that if you wish to set up a 'decoy' drag item, the target needs to be designated as 'none'. I have a D&D question with five draggable items- four of them have correct targets and one is designated a 'decoy' with 'none' selected in the target list. The problem is that the item will still stick to any of the targets and count as INCORRECT. Am I missing something obvious here?

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