Those poses were saved with Morph information in them. The best way to get around it is to load the pose first, resave just the pose without morph information this time and then load the newly created pose to your morphed figure.

Every time you save a pose you're asked if you'd like to save things like morphs and joint information. Unfortunately the pose creators for the poses that are breaking your morphs chose to include their morph information and it's over-riding your own morphs.

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