Results slide not calculating correctly for a passing score

I have 8 questions with a 75% pass rate.  However, when I miss 2 it is saying that I only got 60 points and 60%  and it fails the course.  

On another course I have 5 questions with an 80% pass rate.  I miss one question it gives me 40 points and 80% and I pass the course.  

On both quizzes each question is worth 10 points. I'm not sure what the difference is?

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