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You're right. The drop numbers aren't correct. It turns out there is some contradictory information between different Jmod tweets about some drop rates and so the rates might be a bit bogus.
So hopefully I'll be able to provide better info soon - I'm doing some research on it now.
You can ask me in-game (Gaubarian) if you have more questions
Just as an addendum for whoever eventually reads this: Turns out the observed drop rates were actually consistent with the theoretical drop rates and so no changes were made and it looks like things aren't as bogus as we thought :)