Reality check on adversary weapons

Lately I've been going about the Kuva and Tenet weapons I still don't have. What finally drew me in were the Coda weapons. It's going well. However, I was surprised that I started to get weapons I already had again. One time even a third time. I know I can decline, although usually I don't and just roll with it (yay Valence Fusion :D). But I always thought they'd come in some sort of fixed order. Obviously this is not the case right now, but was it ever thus that way? I'm weireded out by how specifically I misremember that :D

Is this some Mandela effect stuff? Does anybody have similar misrememberings? I mean, seems fun to hear them :)