he review quiz button not working

Hello!  I am using SL2  with both "Retry Quiz" and "Review Quiz" buttons on the Quiz results slide. 

I then use SCROM 2.1 to publish it for the LMS (Moodle 2.9). When I review it on the LMS  the review quiz button does work, but when you click the retry quiz button it does not work.

I have checked the Result Slide Properties and the tick box for "Allow User to retry quiz" is ticked.

Any help would be greatly appreciated.  Thanks in advance!