Hi,
I can see that the submenus aren’t working on mobile (it’s re-createable in the browser as well) but even deleting the meta tag won’t fix the issue. Here is a quick video: https://a.cl.ly/04ud2rP9
If you notice at the end of the video also you can see that a classname “focused” is being added to the gallery menu item when clicking on it, but it’s not really doing anything which would imply that the error is most likely CSS related. I couldn’t see any CSS applied for mobile to the focused class.
It really wouldn’t make sense how the meta tag could break anything on the site though, it literally should be impossible. The only thing the meta tag does is tell the browser that telephone numbers in the HTML content should not appear as links. This is very strange indeed and I’m almost wondering if something else on the site broke and maybe disabling the plugin didn’t necessary fix it – for example when you enable/disable plugins some optimization/caching plugins get reset and perhaps that’s what actually fixed/caused issues – not the plugin itself but the action of enabling/disabling it.
Can you disable the plugin so I can have a look with it disabled? I stored a copy of the site’s source code to compare it now and with the plugin disabled.
Did you by any chance already contact the theme developer about the issue already? I’m also seeing your mobile menu background doesn’t expand fully, the mobile menu “close” text is black so it’s very hard to read and the search icon on the top right isn’t working either. All of which you’ll probably want to fix up as well.