Bukkit

What steps will reproduce the problem?
1. Hold an Item
2. Buy some of the same item from the store

What is the expected output? What do you see instead?
The expected output is to have the items that you are holding in addition to the items that you bought. Aka I have 3 cobblestone and I buy 5 I should then have 8... However what happens is the items you are holding are destroyed and replaced with the items. So I end up with only 5 cobblestone.

What version of the product are you using?
b33

Do you have an error log of what happened?
none

Please provide any additional information below.
That should be it