Blog Link displaying Homepage instead of the Blog

Hi,

Recently a site I help run has had issues with the Blog link in the nav bar. When clicked, it takes the user to the appropriate URL (https://coppinger.co.uk/blog/), however the index page is displayed.

It used to work, and I’m slightly bewildered as to what might be causing this issue.

Any suggestions on how to fix this would be greatly appreciated!

Thank-you very much.