Katarina attacking my own team

I bought 3 Katarinas and had a level 2. After leveling her up to level 2 on the bench, her health bar turned red. When I put her on the field, she didn't count toward my team comp, not even for the count (auto selected another champ when the match started) and she attacked MY TEAM. I couldn't even sell her after. It was the most bizarre thing I've ever seen. Seriously needs fixing.