Some players have had issues with killing Mob type quests.

For example the following quest - http://pastebin.com/JxrZm9SU

How to reproduce:
A player completes stage 1 for example
Leaves the server
Comes back and does /quest
The title of the quest is there but there is no description and no matter how many mobs they kill for that particular stage, it doesn't count.
The player has to do /quests quit then re-take the Quest

I am using Spigot 1.8.7 and quests DeV Build 89.