I’m just setting up the site and have put a site title in. In the preview of the mobile version it is displayed in the header. But on my Sony Experia it is not displayed (haven’t tried any other mobiles).
I can’t figure out why not and would be grateful for your advice
Please note that I can see your website perfectly fine on mobile devices.
It is very difficult to say what could go wrong on your Sony Experia. Could you maybe provide a screenshot of how your website looks like on your Sony phone? I will try my best to guess the issue from there.