In my Survival Games Plugin I create chests with Bukkit.createInventory (null, 27, NAME). Sometimes when you items has taken out of the chests, you cant move this items in your own inventory. This is only possible if you are in the chest, where you can move items. In your own inventory the items get moved only on the client, but once you open a chest they are put back on their old slot.

Sorry for My English.