I'm starting to hate these dailies. Anet, if you're reading this you need to be MUCH more specific in the description if you're going to do this nonsense. A reasonable player sees kill 25 spirits, go kill any of the mobs literally called spirits and assume it's bugged. Either make the bloody thing say go do this one specific event that has the appointed mobs or change the thing to properly register ANY mob matching the incredibly vague description. That goes for every quest of this type and any you might be contemplating in the future.