Header image WordPress 2017

Hi
I am trying to work out if my header image is working properly on the site

It looks fine on the home page, but on all the other pages the image seems to compress and squash. Is this what should happen?
The other pages – by which I mean all except the home page – look fine with the header like this when viewed on a phone, but not so good on a desktop pc.

AM not sure if the image is set up correctly, though it is at the stipulated size.

Thanks
Jonathan

• This topic was modified 7 years, 2 months ago by Jan Dembowski.
• This topic was modified 7 years, 2 months ago by Jan Dembowski. Reason: Fixed link

The page I need help with: [log in to see the link]