Assalamualaikum
we can see a gradual increase in your understanding based on that graph. it’s not as fast as before because the quran is composed of a few words that repeat a LOT, so you make fast progress initially and then it slows down.
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Seeing how there some small bumps as it gradually increases, did you do any practice challenges? If you did and marked something unfamiliar that you got incorrect? That might be why. Or it could just be something else entirely, but this is my guess
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