Caching issue regarding mobile and desktop cache

There is a setting I have ticked that is causing the mobile version of my site to appear when desktop is viewed. please advise.

I have tried clearing htaccess, whenever I purge all, the problem dissappears for a while, then after a while and it has been rechached, when accesing desktop version the mobile version will appear iisntead. stretched accros the desktop.

I recently added argo too, not sure if that is in any way relevant here.