Bukkit

What steps will reproduce the problem?
1. connect to the game and do /wa mailbox
2. Deposit any item
3. Put it on sale
4. Press buy button
5. Go back
6. Press cancel button
7. go to my items
8. U see a dublicated item
9. Put it on sale

What is the expected output? What do you see instead?
That its gone

What version of the product are you using?
1.2.6

Do you have an error log of what happened?
No errors in log

Please provide any additional information below.
If u try to put it in ur inventory by using /wa mail its gone but ur able to sell it

Also this happens only sometimes! after restarting the server i didnt had this anymore