Ninja -
What's happening is that the Mac is "seeing" the display as if it is a "tv", and NOT a "computer monitor".
And, the Displays preference pane is offering you [what it thinks to be] your best options, insofar as controlling the monitor is concerned.
How to tell if your computer sees the display "as a display", or if it sees the display "as a tv":
1. Go to the displays pref pane in system preferences.
2. Click "display", and then click the "scaled" radio button, and observe the choices
3. IF you see ONLY resolution "numbers" (such as "1920x1080"),
the Mac is seeing the display as a computer monitor.
4. IF you see resolution sizes stated as "1080p", etc.,
the Mac is seeing the display "as a tv", instead of as a computer monitor.
Sometimes, how the Mac sees the display depends on what connection method you have between the Mac and the display.
An "HDMI" connection (at both ends) may be much more likely to result in the Mac seeing the display as a tv.
A "minidisplayport to displayport" connection (Mac to monitor) is more likely to have the Mac see the display as a computer monitor.
There's a method that FORCES the Mac to see a display "as a computer monitor", but it's a little involved.
It -CAN- be done (I've done it on mine).
Here are instructions on how to do it:
http://www.mathewinkson.com/2013/03...ix-the-picture-quality-of-an-external-monitor