Uzer Tekton
When looking up or down at moderate to high angles, Selfie Expression
on
will affect the IK too much for lower body.
Since Selfie Expression is primarily a face cam, I wouldn't expect it to have IK weighting below the chest/spine bone. In real life even if I move around the camera, it is mainly my head and my chest moving, my spine and root/hip bones (IRL) don't move much if at all.
First image: Selfie Expression
off
(normal looking)
Second image: Selfie Expression
on
(too much lower body IK weirdness)