Multi-Villain From Garen

So i was in a custom game recently playing around having fun with friends when i noticed something weird. My Passive target bubble told me that Evelynn was my Villain but above both Orianna and LeBlanc's heads i saw my passive, not only that but i could attack them and deal the true damage as if they actually had it. In addition as long as one of those three champions was my Villain they all were no matter how many times i killed the three. Now it did fix itself once the enemy Jayce became the Villain but this might show up in other games and that would be an unfair advantage.