Same concern here. Upon checking the official demo of the site on my mobile device, the same thing happens. Is it possible that the header image somehow resizes to fit the mobile screen, and not ‘zoom in’ to just a portion of it? Making my desktop Chrome smaller does the ‘proper’ thing, though.
This would be ideal:
https://i.imgur.com/4DWCbEI.png
Not these:
https://i.imgur.com/1NH6gcH.png
https://i.imgur.com/i8H6ot9.png
Hopefully this is not a premium support request. Thank you so much.