First of all love the game. I have killed a zoo on 3rd floor. Now on the 4th floor I found a zoo, killed it but still says 22 monsters left. I was like oh well continued playing thinking it would fix it self. It has not. Than mst of floor cleared I found a quest statue - to kill some one on 4th floor (current floor)..can't find him anywhere (nothing on minimap showing anything either).
I've noticed that a lot of those wraith type monsters will blink themselves away, and some of them end up outside the actual zoo area. I had to chase some down to complete a zoo today.
Same happened to me. Also, I saved with 20 monsters left to kill to complete a zoo. I've loaded the game, killed the 20 monsters...but I had the same message: 20 mosters left. Of course, I was unable to complete the quest.
