Extra display automatically added in between actual displays???

I used sudo nvidia-xconfig to create a sane xorg.conf file using Nvidia 346.16 but with this xorg.conf
http://paste.ubuntu.com/9160548/
i’m getting a 5760x1080 X screen. Here’s a screenshot from nvidia-settings
https://picasaweb.google.com/107176979245466375817/Public#6084329695975726866
and everytime i fix it and save a new xorg.conf it still does the same thing after i log out and back in. Someone suggested I comment out the metamode line so I did and sure enough it works BUT i’m wondering why X org is doing this if my xorg.conf was generated by nvidia-xconfig or even me manually adjusting it using nvidia-settings and saving a new xorg.conf???