A lot of the poses in the libraries contains morph information. You're not doing anything wrong, the peep that created the pose did ;o) Either pose your person and THEN do the face or use Schlabber's poses, his are free from unwanted facechanges :o) And someone else in here with their bookmarks in order will most likely give you (and ME) the link to his site...

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You just can't put the words "Poserites" and "happy" in the same sentence - didn't you know that? LaurieA
  Using Poser since 2002. Currently at Version 11.1 - Win 10.