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Think of it this way, you play a game at a carnival or something like that where the person tells you that you have to pay 2 dollars to roll a die, every person who comes up can only win each prize once, he will not give out doubles to anyone. You see something you want, and fail to find it anywhere else, so you choose to play his game. You pay once and roll a 5, the item you want is a 3, so he gives you the prize for your 5 and you pay again, now you get a 2, and get that prize, but still not what you wanted. Without giving up hope you roll once more, and now get a 5 again, he tells you since you already have one of the prizes he gives out for a #5,, he will not give you another, but at the same time, he will not give you a free reroll either. Now you have to keep rolling, over, and over again, but you can not get repeats as this person knows you have one of that prize already, while he also will not give you rerolls if you roll something you already have.
It's not even like that. These fights are programmed to give you the non- weapon and armor drops more often. From Hurkan you will get the bullet/grip way more often than the other drops, for instance (so far from 6 Hurkans I've gotten 4 bullets and 2 grips). So it's like a loaded die.