"URL is not on Google" indexing problem

I’ve noticed that some URLS on my site are not indexed by Google, yet are visible and indexing is allowed. The pages are nearly a year old so I’m confused as to why these are not getting indexed?

An example URL is ttps://www.fixfire.co.uk/casestudy/mary-stevens-hospice


Here is my site Read-Only: Webflow - Fixfire
(how to share your site Read-Only link)

Did you click the learn more link?