I think it's possible to confuse Poser if you are saving a character in multiple ways frequently, especially if you're saving injection files too. So if you're saving to a pz3 and also a library cr2 and also to injection files, sometimes during these juggling acts there will be multiple pmds, apparently with bits and pieces spread throughout. Additional saving seems to round all that up, looks like that's what happened in my case... but I do some not typical editing and hoop jumping with many morphs. Just my take on the weirdness I mentioned above.