Whenever I try to control the face of a CC character (be it free CC characters, Headshot generated, Content Store bought) using my iPhone, I always have this mismatch between my face and that of the character: When I smile showing my clenched teeth, the CC character opens its mouth more than I open mine, and it doesn't clench its teeth. Yes, there's always a gap between the upper and lower teeth of the CC character.

Does anyone experience the same?

How do I tweak this?
Thanks.