Just noticed that in the description, you tell students to select from drop down? Is this something you added or are you maybe previewing an old question that it just a regular match?
When I couldn't get it working properly, I changed the description to match what I was getting. The question was generated fresh for this drag-and-drop module. Thanks for testing in Rocket, that eliminates that problem. I also tried with a standard theme. Would you mind checking in Rocket with the Bootstrap Styling turned on?
Thanks for your review.