Most Hairstyles are blank/bald, and some make the game crash?

So since I've started playing on this server, I've only used 1 mod, which is the Draenor HD models. BUT, for some reason the majority of the hairstyles (I'd say at least 40% of the hairstyles) are either bald, or crash the game when I confirm on the hairstyle/make the character. The others work fine and are the HD hairs, but it makes the character creation part of the game (and as a person who is the biggest alt-oholic) a lot more basic and limiting. I've been enjoying the game, but I'm wondering if it's something small that I can fix, or if it's the HD models, or what.

(I've had this problem for a while, but I've just dealt with it and ignored it, but I figured I might as well try and get it solved.)

Does anyone know anything I can try besides removing the HD models, ect? If that is the problem, I am willing to remove the models... But I'd hope for otherwise.