Bukkit

What steps will reproduce the problem?
1. Put stuff inside a skybank chest
2. Relog
3. Take the items you wish to dupe and close the chest
4. Open it again and they are still there

What is the expected output? What do you see instead?
The items I took out should be gone, but they are still in the chest and now also in my inventory

What version of the product are you using?
1.5.3

Do you have an error log of what happened?
No

Please provide any additional information below.
Virtualchest also had this bug

I have tried to do it in many different ways, but it doesn't seem to duplicate the items. However, I have found an issuje which corrupts slots.

Do you still have this issue? If so, please check your plugins. I can't find anything wrong.