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×There is a secret staircase hidden in level 16 that warps you ahead to level 19, effectively skipping levels 17 and 18. Since CaravelNet shows you as having scores in all of the required rooms in levels 19, 20 and 21 it would actually be possible to progress up to level 22 without ever completing level 18 and have the scores it shows you as having.
Of course there might be an actual issue with high scores appearing out of nowhere going on. I don't know.
I just figured I'd share a possible explanation that came to my mind.