Just redone the 1.3 DOM Quiz in Chrome Version 52.0.2743.116 (64-bit)
Clicked Finish Quiz, got result 9/10, clicked button on the left and same thing happened. It went back to the start of the quiz instead of marking the section as completed.
Do you actually see the quiz results at all or how many times I’ve done them? The first two quizzes run normally but I have had the same problem with 1.3 and 1.4. Same laptop and same browser for the 4 quizzes, the only thing that has changed at my end is the geographical location. Would that be a factor?