Bukkit

What steps will reproduce the problem?
1.Win prize from the hunt
2.Right click the item in inventory
3.Item disappears

What is the expected output? What do you see instead?
Items that you win are supposed to stay with you, instead the disappear; most often when you right click them in your inventory or in hand.

What version of the product are you using?
The latest as of this message.

Do you have an error log of what happened?
I have logs; however, I'm not sure I see anything specific to this event. I've tried my best to make sense of the logs, did ctrl+f in notepad and did a search for "error" and really nothing came up.

Please provide any additional information below.
When people try to trade items by dropping it on the ground, it will show in the world but it becomes unable to be picked up. Also, once I was able to pick up a stack of items I won in my inventory after the night was over and I could keep right clicking in another slot and make an unlimited amount of that item. Typically though, people will often win and the items they won from the contest just disappear when you right click them in your inventory.