Odds are you attached a new part of the model to an existing part (head perhaps) and the Uv map is trying to jump back causing it to become twisted, there isn't a way to fix that that I know of, unless you seperate all the sections by selecting the poly's and detaching them eg; head, arms, torso, legs, cloak, ect...then you can skin (UV) each part separately, It's probably easier to call it quits and start again.
Try not to use attach new parts when in edit Poly mode, most things can be attached via the graph editor directly to the bones, then they don't need a skin modifier either.
Is that to complicated?, sorry if it is, it's late.
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