Pixelmon Mod

My EXP.Share was suddenly gone from my Dragonite. I checked every possible inventory slot I had, and it's nowhere to be found. I've had this happen with a few other items(Life Orb, Heavy-Duty Boots, Rocky Helmet, etc), but the EXP.Share is much more important to me. I hope there's a way of getting it back, please and thank you.

How did you obtain the exp share in the first place? Did you craft it or was it a drop from a pokemon?

I have also had this happen on my server, items that are drops/crafted or spawned in via creative mode. They will stick around for a while but then they will suddenly disappear for no reason.