Actor bounds changing size by itself

I have weird issue which I cannot figure out, I am quite new to UE4 so hope someone can help me:

I have a custom (C++ written) actor with a default sphere component attached. The actor itself is a child of the third person character. Inside the actor I request the bounds size of the sphere (GetActorBounds), but for some reason the size of the bounds changes slightly with the orientation of the character. I am not doing any scaling myself, so don’t know why this happens.