I don't have this figure so I can't check it myself. It looks like the parenting for the eyes is getting changed as a result of applying the hair. I'd take a look at that first. I'd also try applying some other hair props to see if it occurs with again. If it does, look to see if there are any actor names common to the hair props that may be causing a problem. I'd also check the heirarchy window before and after apply the hair to see if there are any changes. Probably not a solution here but at least you might find some more info that will point in the right direction.