Force of Nature shrink 1 team size.

On one of my TFT game yesterday, I brought the Force of Nature, I put it on my Attroxx , but it doesn't provide me one team size, instead, it shrinks my team size by one. plz, Riot check my game history yesterday. I was so excited to see if I could put another champion on the stage, but it didn't happen. From that game forth, I never brought the Force of Nature, it's a cause to me.