Forum:Undead overrun auto-aim

I noticed when playing Undead Overrun on Red Dead Multiplayer that when my sister plays, the auto-aim aims at the zombies' heads, but for me it aims at their torso and I have to manually aim for their heads. Is it because I'm level 39 and she is level 17? Or is there a way that I can tweak the settings so that it aims at their heads?