Set items / RNG

I am paragon 190 and have never yet seen a set ring drop. Last night I ran somewhere between 20-30 dungeons with a group and saw 10 rings drop for other players. New players would rotate in for one dungeon and have a set ring drop. I am still playing with gold rings, and this is just ridiculous. I know RNG is RNG and all that, but I feel like either there is something wrong behind the scenes or I’m seeing odds roughly 10 times better than getting a 5-star gem with every run. This is seriously affecting my ability to improve my CR.