We were shown that the twitching in my client [name withheld] was caused by her human lost soul spirit attachment who had died struggling to break free of restraints and was still trying to break free, but now making her body move. Was this correct, and if so, why was our karmic repair and spirit removal not able to help her symptoms?

This indeed was correct and is correct. The reason for the persistence of the symptoms is the memory traces still carrying over; and this is being revisited because of the inner emotions of fear, worrying about the implications here and the consequences for her future both. So this will indeed fade. You can reassure her to ignore the symptoms and give her the encouragement they will fade, and ask her to get back in touch with you if this does not happen soon and you can revisit her with your Protocol and further healing requests will be able to help as well.