Retry Quiz not working

I use the Retry Quiz command in all my courses. For some reason, for my latest course, when I click "Retry Quiz", it jumps correctly to the first question. However, after answering the question and clicking Submit, it does not advance to the next question. I'm stuck on the quiz slide forever. 

I have recreated the "Retry Quiz" button by clearing and then restoring the retry option, and still can't get it to work. The coding appears identical to previous courses. Can you help me understand why it isn't working?

Thanks!

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