Issues with mobile browser on ad-category page
I have a long standing problem with a certain page using the simply responsive theme. I have used the demo page set up by the child theme author and the problem i encounter isn't on that page.
When i navigate to the ad-category page (i.e. clicking on a category to view its listings, the menu loses styling on both mobile and tablet browsers. I have attached an image from the customizing section showing the issue on mobile, tablet and desktop. It is perfect on desktop. How can i resolve this issue?