Odd character behaviour Pose Editor

Hello, something odd has happened, and I'm unsure how to revert the shoulders back to their original form.

This is how the animation should look like (currently not selected in Pose Editor)

But it looks like this when selected

Any idea what could cause this to happen? The only thing I did when this happened was duplicate the existing character, but now for whatever reason any character I have will have this pose when editing.

I have tried to IK setup Wizard again but didn't work either.

(EDIT: It worked fine Sunday with no issues until I did something strange and now has this stance)