this is the 3rd kinda bug so far

[bobo29]

Leveling guide 25-30 step 66 guide tell me to kill 4 Fen Creepers but instead i need to kill 12 for the quest. This is the 3rd time so far it tells me to kill less trash then needed and the next step in the guide is to HS to the opposite part of the map. Great job! Keep it up!

[Zygor]

There is a tip in the step that tells you that you will kill more of them later. It's intentional, and broken up as you do other quests, because they're so spread out.