This morning I updated the GP theme from 1.2.8 to 1.2.9 and noticed that the navigation menu on the website is now the same as the one for mobile devices, i.e. a clickable drop-down menu. When I go to customization of the site, it shows the “normal” one, otherwise mobile. The same thing happens when previewing some custom CSS code (also when commenting it out, i.e. completely removing it from the system) – it shows the “normal” navigation bar, not the drop-down menu.
The new version has been submitted to WP.org – just a matter of getting reviewed and pushed live now.
What caching plugin are you using?
It’s a shame these caching plugins don’t ignore styles with a media query, as this option would have made it possible to easily change the mobile breakpoint. I’ll have to chat with some of these caching plugin developers.