I had almost the same problem - the image had the correct number of pixels but left a 1 inch or so margin all around. Try disconnecting the monitor cable with the computer on, then reconnecting it and letting the computer find it.
Other suggestions - make sure you have the latest driver from the monitor maker. What version of Win 10? (10162 is currently latest)
Also, did you install Win 10 from an iso image? Might make a difference.
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