It looks like the Ninja Ki Pool class ability uses the text from the Monk's Ki Pool lass ability. There are some rather significant differences.
Oh wait, the real problem seems to be there are two Ki Pools on the Ninja's OS. The Special Attack, which uses the Monk's text. and the Special Quality which uses the Ninja's text.
sigh okay, I'll see what I can do...
Completed: At revision: 19863-4
The sneak attack text also appears twice, that seems not to have been solved; only the Ki Pool part.