Chill.

Hey, mine did the same.

I'm not complaining.
I think that they were too easy to get in V2.
The reason they morphed is because he changed their QLVL, or how hard they are to acquire. I had found many of the Arch-Weapons before V2+, but since V2+ I have found none. That's how I know "they" (he) changed the QLVL. :)

Also, I notice that he balanced the Arch-Weapons out more, which I like. I thought that they were too godlike, myself. But, now, since they're so hard to find, maybe not so. :)

I had found 15 Shamans, 4 Justifiers, 7 Judgemental Bows, 4 Juggernaut Plates... They all morphed. But, I'm getting back up there.