I am fighting with the new heads plugin to prevent it from dropping mob heads. If you are getting mob heads after this has been posted, please make a ticket. I will try to switch that off. Also, there are some mobs which drop bugged heads that can be multiplied after drop & break. If you break a head and get 2 back PLEASE destroy those. I do not want bugged blocks around on the server since we have NO idea what other problems they might cause.