Crafting?! I crafted multiple MaxDoc mk 3s and only one is showing up in my inventory

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So I craft multiple MaxDoc mk 3s And it only ever gives me one. Like I'll craft 10 and then I'll look at my inventory and there's only one to use. So I waste all those crafting materials for what? Am I not supposed to get an item when I craft Is it just like a 25% chance that the item will actually craft or something?

so I tried crafting and then dropping each one and I went to pick them all up and it's they all disappeared and I still only have one in my inventory,
 
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