That is definitely a bug in the Character Creator, the head model (which is separate from the body model) is not geometrically capped so you get to see through the neck on some angles. I will see if I can adjust the ragdoll system so the neck cannot expose this absent geometry (rather than adding extra polygons to every head).
PC SPECS: Windows 8.1 Pro 64-bit, Intel Core i7-5930K (PASSMARK:13645), NVIDIA Geforce GTX 980 GPU (PASSMARK:9762) , 32GB RAM