Item Sets in macOS Sierra

I have made the same observation. Good to know that it isn't me just being a noob.

Same here. I can't believe there's so few of us commenting on this.

Same here on three different Macs.

Thought I was the only one with this problem!!

Soo its been two months now.. any fix ? Bug still happening for me

Same issue here on my Mac. I read a Riot post somewhere that since nobody uses the item sets that it was going away as a feature. So, I wouldn't expect a fix any time soon if at all.