Responsive display issue with Site after upgrade to 17.3

Hi All,

We are facing a responsive display issue after upgrading to 17.3 in our Site component. At 1024*768 resolution  We are getting tabs at the  bottom of the browser and user image at the left upper corner , which resemble similar to a mobile view, please find the below first image

I tried to debug in Crome developer tools and when I increase the resolution by 1 pixel to 1025 *768  it comes properly at the top.Please find the second image.

     

Please let me know , if it's a responsive design issue come up in 17.3 or there is some design change we need to implement to fix the issue.

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