A pose should not change any applied morphs on a figure. If it happens then the person who did the poses saved them with morphs included instead without  - means the pose includes all figure morphs set to 0 and that's why it changes your character. This is not the right way to save poses and this person should actually fix it.

This is something that should have caught by the beta testers and the market place testers.

Every organisation rests upon a mountain of secrets ~ Julian Assange