I have the exact same issue as: https://www.joomlart.com/forums/d/30221-mobile-layout-issue-on-fresh-install
Can you please explain the steps you undertook there?
Hi vlokhoven88
Try to take a backup of your site first then go to Admin panel > Extensions > Templates > GK Quark > Advanced Settings tab >> enable the 'Recompile LESS' option and save: https://prnt.sc/t9nn5l