I recently got into making textures and one thing that's really been bugging me is the distortion on the top of your Tori's head. Is there any way to by pass this or is it unavoidable?

Note:
I know how the head mapping works, I use the template and all but I am confused why lines at the top of your head get distorted when they are supposed to be curved.

Any help solutions would be greatly appreciated.

Here is a link to an example of my problem: http://postimg.org/image/kfqmvk91r/