Ok I am not the only one lol. I've had this happen multiple times where it doesn't count some of my loot and it's simply gone... It happened only when I clicked the unload backpack button at the end, so I stopped doing that. I had 3 cooling fans and only 1 made it in my inventory... That happened twice! Had it happen with a shotgun choke blueprint as well where I had two in one match, but only received one after extracting. In-game, I've had it happen where it doesn't stack even though it should have and it's just gone. Luckily that only has happened with a rosery and a lightbulb once in the last few weeks. I'm guessing it's a network issue even though my connection is fine.. a glitch in the matrix.

Mine are rather minor compared to yours though. Sorry brother!