Bukkit

What steps will reproduce the problem?
1. build an iron door    6 iron ingots makes 3 iron doors
2. salvage it   salvaging each iron door makes 3 iron doors
3. you get 9 iron ingots while you just used 6 to build it all

What is the expected output? What do you see instead?

im supposed to get less than 6 iron ingots when salvaging doors  not more
What version of the product are you using?
latest

Do you have an error log of what happened?
nope

Please provide any additional information below.