Iono doesn’t do what it says it should and it cost me a game

I played academy at night and placed a onix card on top of my deck, then played iono to get a new hand since it specified that only my hand would get shuffled and put on the bottom of my deck, however it reshuffled my deck as well not allowing me to draw my onix and causing me to lose out on a devastating attack and losing my pokemon, does anyone know why iono doesn’t work like it says it should?