Setting up https URLs

Hi,
The site I’m developing is jerrysguitarbar.com

I have just had SSL installed by my hosting company but I don’t see https:// on all pages. I have changed ‘settings’ ‘general’ to show https for my main URL but what I find is:

All pages on the main menu bar are showing as https, except for the Homepage. However if I access the Homepage from the Dashboard it does show as https.

All nested pages do not show as https. However if I view them in the Dashboard (under ‘pages’) the permalink shows as https.

For example this is the permalink shown for one of the nested pages:
https://www.jerrysguitarbar.com/guitar-video-courses/guitar-courses/the-acoustic-guitar-course/ ?

but if you simply navigate to this page by clicking through the site it will show as simply www. and the URL bar will say it’s unencrypted.

Any help gratefully received!

Jerry