Bukkit

What steps will reproduce the problem?
1. Herobrine heads will not stack if obtained at different times
2. They will stack if obtain from same chest it seems around same close area you stay in,
3. Had 4 stack together at one time

What is the expected output? What do you see instead?
When collecting heads Herobrine leaves you, they wont stack, take up different slots like some metadata thing maybe.

What version of HerobrineAI are you using?
The latest for August 31 2014

What version of Craftbukkit are you using?
spigot 1.7.10 - 1.8 compatable

Do you have an error log of what happened?
No error show in logs

Please provide any additional information below.
Player heads use to stack. On a side note I have noticed no natural wolves spawn since using Herobrine Plugin