Drag and Drop Works Only Once

Does anyone know why my drag and drop question will work when I first create it; however, when I go in and edit the drag items will no longer drop on my image?Sometimes the drag images seem to have moved in the "Place drop point" function; however, the problem remains whether the items have moved in the "Place drop point" or are still in the same place. I've recreated one drag and drop several times and the problem is the same.Thanks.

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