Head mesh.

[Force2013]

hello i need some help with a few things. when i use nifskope and open a random head model like Femalehead and get it into blender and do some changes with sculpt tool and the problem is when i get it in the game the model appear but the thing is i can edit the back head the ears but when i edit the face part of the head model it goes all crazy like polygons sticking out of the face area like it got run over by a train!

 

so how do i fix this problem need the help so i can make new races and stuff.

 

thanks for your help, and if you help i might be able to provide with some new mods