[Unity book] CharacterController and colliders


I’m currently going through the Unity book published by RW and have come across something. More specifically, in the first game, namely Bobblehead Wars, the hero, which is attached by a CharacterController, is “lifted” up every time an alien, which is attached by a sphere collider, comes into contact with it (or collides with it). The question is: Is this to be expected?

I have tested with step offset and such but this keeps happening regardless. I want to make the hero stable, meaning that it will not be moved in anyway except from the player’s input.

Your time is appreciated.