ItemSmeltedEvent, keeping track of items smelted

[KeeperofMee]

I'm trying to use ItemSmeltedEvent in order to keep track of items smelted(I've added a few "rpg stats"), the problem is that the event differently on shift and normal pickup so I printed them:

 

Pickup:

3xitem.ingotIron@0

EntityClientPlayerMP['kimeriderf'/121, l='MpServer', x=17,65, y=94,62, z=141,45]

--------

3xitem.ingotIron@0

EntityPlayerMP['kimeriderf'/121, l='New World', x=17,65, y=93,00, z=141,45]

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Shift-Click:

0xitem.ingotIron@0

EntityPlayerMP['kimeriderf'/121, l='New World', x=17,65, y=93,00, z=141,45]

--------

0xitem.ingotIron@0

EntityPlayerMP['kimeriderf'/121, l='New World', x=17,65, y=93,00, z=141,45]

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The problem is that in order to keep track of the items smelted I increase my  own int with the stacksize of the event.smelting, but as you can see shift click triggers twice on server side with a stacksize of 0. Is there anyway else I can keep track of items smelted properly