To reproduce, separate the eye look values into left and right, then only set rotation values for one of the eye bones and keep the other eye bone at 0 rotations for all states
The other eye bone will copy the Left and Right rotation values of the eye bone that had them set
The up and down rotation respects the split values
This is a problem for stylized avatars that need different L/R values for looking left and right, and overall unexpected behavior
I tried on two different avatars, one with 0 values on the left eye bone and the other with 0 values on the right eye bone
I'm not sure if the problem is on any platforms besides PC, I assume it probably is
It happens with Selfie Expression as well

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