Macbook does not have my monitor's native display.

I'm using an acer H233H Monitor, and I have it connected by VGA. I have my macbook screen close, so it is only displaying on my monitor (not extended desktop). My monitor's native screen display is 1920 x 1080. However on system preference i only have 1600 x 1200 then the next one is 1920 x 1440. Whats weird is that sometimes (rarely) it would recognize the monitor and have the settings on 1920 x 1080. But its not stable, so i was wondering if i need to download any drivers or perhaps is there some settings on the mac im missing out on.
Thanks in Advance.

Another possibility is a broken wire inside the adapter. Sometimes it is making contact and sometimes not. Those times that it is working correctly vs. those times that it's not, do you notice the monitor is identified differently within Display Preferences? That would be further indication of an intermittent connection issue.

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