2nd thunderbolt port has limited resolution

Hi, I've got a late 2013 15" retina with a discrete graphics card. For some reason, when I connect external monitors to the 2nd thunderbolt port (the one closest to the USB port). I can't get resolution greater than 1920*1080 on an external monitor (Dell U2713HM). On the other port I get a full 2650x1440. Is this a known problem that I've just discovered?
It happens with both minidisplayport to displayport, and minidisplayport to DVI connectors.
I've tried to sort things out with switchResX, but at 2650x1440 it just squeezes the display with black bars at the top and bottom.
any ideas or help would be great.
Thank you

same laptop, i can get native resolution on 2 apple 27 displays so unsure why you're not able to
try both pram and smc resets and test again
also is it detecting both displays as monitors or TVs?

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2nd thunderbolt port has limited resolution

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