Looks like your goggles load with the same problem. There are additional bones for them & their weights are causing the problem when exporting somehow.

I was able to export them separately, keep the rigging and morph, and then re-parent to the characters rig w/o the distortion.

The hair I'm not so concerned with in DS as I make can my own "HatHair" morph later in Modeler.

Good to know you that can use MeshGrabber on the SY helper though.