Unable to get 2560x1600 resolution when connected with 2 monitors having resolution of 2560x1600 and 1920x1080

I have 2 monitors connected using display port 1st monitor supports 2560x1600 and the second monitor supports 1920x1080 when connected mode my first monitor only shows the max resolution of 2048x1152 but when I change the setting to show only on 1 then I am able to get the 2560x1600 resolution.

enter image description here

Know someone who can answer? Share a link to this question via email, Twitter, or Facebook.