Quiz Results only showing 1 question repeatedly

Hi, since the last update of the plugin, the results of the quizzes we have in several of our websites are only showing the first question repeatedly. It seems to happen randomly, the results of some quizzes are showing fine but suddenly one submission is showing like below (both looking at admin results and email results). Why is this happening? Thanks!

Quiz Result - Columbus Spanish Place - Placement Test
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User Detail
NamePhone
Scorecard
Correct Answers:15 Out of 40Points:3Percentage:37%
Time Taken
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User Comments
Responses
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