I've done so many legend sectors for arms and after 13 it dropped an exotic arms piece I already have... Isn't it supposed to only drop ones you don't until you have them all in that category (arms)? I did this a couple days ago for chest armor and it did the same thing. 5 pieces I already have and no new armor. Doing these on my hunter, every time I'd do them it'd drop a piece I didn't have and usually only took 2-5 completions. Is this bugged or did they change something about the lost sectors