When you morph into another mob in version 1.12, the camera would be on the smaller one among the mob you morph into and your original human character while the hitbox being the larger one.

As Morph has just been rewritten and released for MC 1.16.5, I am clearing the issue tracker as I have not provided any support Morph for 1.12.2 and earlier. My apologies for not addressing your issue.