missing mouth on Eiries Ohmes-Raht Race

[Skull Tyrant]

ive been using the Eiries Ohmes-Raht Race from Halo's mod page for quite a long time now, and ive always had a problem getting the mouth to show up in game. it shows up in CK though. is there a way to fix it so it shows up in game? im not very good with CK, ive been trying to figure it out on my own but have had no luck. any help would be greatly appreciated. thank you