Actually, the option “Mobile Content Optimization” is used to help to disable unused HTML, CSS, and JS of the desktop elements for mobile versions. Keep disabled if you use cache for the mobile devices of the cache plugin, and I can see that you are using cache plugins and other cache options too in the “Speed optimization Wizard” feature of our theme see the image: https://postimg.cc/MvVrRfkb and https://postimg.cc/q68XtntN so it might be possible that the options are conflicts with each other also with the plugin too.
So please disable this option “Mobile Content Optimization” and use the other optimization features of the theme and of the plugins in order to optimize the site speed.
And I have tested your site on my personal mobile phone and the header on my mobile is working perfectly fine, here is the detailed video: https://www.veed.io/view/3ad23785-4dda-4a62-af42-b451daf23ceb?sharingWidget=true
Regards 8Themes Team.
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