When is a kanji actually passed?

Sorry - dumb quick question here:
I’m on level 10, and it says 30 of 34 kanji passed… but there are actually 37 kanji on the page for level 10. Why doesn’t it say 30 of 37 passed?
Thank you.

In order to complete a level, you need 90% of the kanji to reach the Guru level. 34/37 kanji is 90%.

Got it. Thank you!