Hi,
If you want the dropped state to be remembered you need to include the Drag and drop interaction in Quiz.Also you can add some marks to the dnd interaction. If you do not want to add the marks to your total marks of your quiz(if you have any quiz in your course) check off the option "Add to total" option. There is an option for reporting the marks as well. Just check the "Include in quiz" option and let me know this addresses your issue.
You can find the"include in quiz " option under reporting accordian. Attaching screen shots for your reference(in both Cp7 and Cp8)
Devraj