I have some very distressing news.  Your/Mike's rig has the fallof zone "flipping" problem and some of the joints are not symmetrical as they ought to be.  One place I see is at the collars up/down (attached).  This is a bad bug in Poser and you have my most profound condolences, in my own experiences this is impossible to get rid of once it appears.

I've seen this before with other figures that have this bug in them (DAZ SP3's feet and conforming shoes e.g.).  I don't have any advice for you on this other than to push Poser's support team to actually fix this bug, it's been around for years.  I don't know how serious the effect will be with your figure in particular, but it is very bad in the way it manifests in SP3.

edit: no, Figure->Symmetry does not fix this.

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