The plays on the main page for the quiz is updated less frequently than the scores page. It will take a while for them to catch up to one another, meanwhile, people are still playing your quiz, so the two scores will never be in synch.
Its not a bug, just a synchronization glitch. If you want them to be equal, take the quiz offline and wait a few days. Otherwise, just let people enjoy the quiz, and don't worry what score they got.
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