[GL2750HM]Why using the MacBook Pro Retina HDMI output the signal for monitor, the display is normal but wording have little bit stretched?

If monitor OSD input resolution information is not same as notebook setting, that mean the monitor no get the correct input signal from note book, so the monitor will doing the auto scaling by itself to simulate and come out the full screen resolution, then let user can see a little bit stretched at wording condition. Suggestion user manual to setting the