Book level in gradings on book page wrong

Description of your request or bug report:

I found a bug that I don’t think is related to the overhaul :thinking:.

On the book page for 너의 유니버스 | L24 there’s one book where I noticed that the level in the gradings doesn’t match that book’s level.

Indeed, 편의점 가는 기분 is currently L28, not 31??.

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