Metahuman Skeletal Mesh to Pose completely changing shape. Any idea how to stop it?

https://preview.redd.it/3nyru6mic8ph1.png?width=2000&format=png&auto=webp&s=73a713bab7a3f46e86cf74452c46f63c4a616445

I have a workflow that requires me to generate a Pose from a skeletal mesh. It's for marvelous designer to create clothing. But when I generate the pose from the SkeletalMesh (Left) it seems to be completely changing the composition of the body. This doesnt occur in the tutorial im following. Does anybody know what could be causing it.