Yes this is an issue : please note the quiz passing score settings : if a user marks greater than passing score you set in quiz only then continue otherwise stop. That is why you need to set one marks lesser than the expected passing marks in your quiz passing score settings. Example: in a quiz, if you want to set 15 marks as passing marks then you would need to set 14 as passing marks. Our problem is changing this logic is that there are many users who have set their passing scores according to the above logic and if we change it then they might need to update all of their quizzes.