Every cat is different, just like us. We have obsessive compulsive behavior ourselves, such as knowing that the doors are locked, but relocking them anyway. And there are people who wash their hands repeatedly or take 4 or 5 showers a day. Your cat is just a bit obsessive, I think. Try just shaking the box of fresh litter instead of adding more, and see if that helps. I wish you the best.
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A dog, I have always said, is prose; a cat is a poem. ~Jean Burden