Disappearing Shotgun

[fcolley3]

I've just started using guns (shotguns) in the game.  I had 10 shotguns in my inventory. The condition was already less than 100% on 4 of them when I looted them. When I tried to repair them, using the other 100% shotguns, they just disappeared. I looked for them in my backpack and my inventory and they were not there. This is my first time trying to repair a gun. Did I do something wrong or is this a bug?

[Pandorea]

From wiki: Ranged weapons that need repairs require a player to be holding two of that type of weapon in main inventory in order to use one for parts in order to effect a repair of the other. One of the weapons is consumed in the process, the other is returned to you with 50% of its condition. It is therefore best to choose two weapons that each have less than 25% condition in order to receive the most benefit when repairing guns.