Cannot See Model "malebuilder_eyes.j3o" From Asset Pack When Looking at it From the Front

I am using the “malebuilder” models from the asset pack and everything seems to work fine (the body, head, cloak, shirt, pants). However, when I attach the eyes (malebuilder_eyes.j3o), they seem to be front-culled (i.e. you cannot see them from the front, but can see them from behind). I was wondering if this is a normal vector problem or if it is something else and if anyone knows how to fix it.