Quiz doesn't record answer correctly on Mac running Sierra/Safari

Hi -

We've encountered an issue while testing a course that I don't know how to fix.

Our course is published in Articulate Presenter 13 as SCOMR 1.2, passed/incomplete with HTML5 option. Works well except for our tester with  a Mac running Sierra using Safari. For this user the course plays as expected except that the quiz records correct answers as incorrect.

Any ideas on how to fix?

Thanks!

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