AI chooses bad targets for Desert Twister. Once I had 1 2/2 and 1 4/4 creatures with flying. I summon a 1/1 with flying. Next turn AI casts Desert Twister on the 1/1.

Another time I had a 1/1 creature with flying and I summon a 2/2 with flying. AI again casts Desert Twister on the 1/1.

It happened other times too, I don't remember details but AI targeted the obviously not better creature.