Also if you are recombining or saving morphs you kind of need to watch out for JCM's. It's best to save your morphs from a figure that has a zeroed pose because Joint Controlled Morphs can creep in to your new saved morphs unintentionally if a pose is adding one in. They are invisible in terms of their parameter values because they are controlled by the joint (or other part's) movement. If you ever spawn a new morph and find some unwanted distortion is slowly being added in a hidden JCM is almost always to blame.

"Your work is to keep cranking the flywheel that turns the gears that spin the belt in the engine of belief that keeps you and your desk in midair."

Annie Dillard