I apologize for resurrecting this thread, but I did not see a direct resolution. Going into DAZ, I realized that this hair has multiple "settings" which makes it, in my opinion, unnecessarily complicated. Regardless, going into the geometry tool, selecting the geometry for the 'bun' (if you want to see the ponytail), selecting the surface "backunder", hiding it, then deleting it resulted in fixing the back part of the hair.
Unfortunately, the front part is still an issue. You, again, have 2 silly options for "bangs". A sideswept look or a straight bang. Unfortunately, with this one, it gets more complicated. Even though I chose the "sideswept" version of the bang, the original, straight bang still casts a shadow:
Please pardon my godawful quality screenshot. Even though I've "moved the polygons from her face", Octane still thinks the straight bang is there, and is thus creating a shadow.
I do not know how to resolve this, and welcome any assistance.