Why does a track from the top stop selling?

Why does a track from the top stop selling? Hey! I have a question for administrators. From time to time my logo gets into popular items. I noticed this pattern. When a logo appears in popular items, it hardly sells. But after that, he leaves the top, while remaining in the Hot under $ 8 category. And it starts to sell again. He has about 5-6 sales per week, which again brings the logo to popular items. And as soon as it gets there, sales stop again. Explain this paradox to me?