Problem with non secure site and letsencrypt

My YunoHost server

Hardware: Raspberry Pi 4B
YunoHost version: 11.2.30
I have access to my server : Through SSH | through the webadmin | direct access via keyboard / screen | …
Are you in a special context or did you perform some particular tweaking on your YunoHost instance ? : no

Description of my issue

Afternoon all. I have just installed Yunohost and trying to get the letsencrypt certificate to work. I have setup the DNS records on Cloudflare successfully and generated the letsencrypt certificate correctly but I am still getting “Not secure” in the browser bar and warnings about the website being unsafe. On the domain page I get letsencrypt and a green thumbs up icon beside the SSL certification authority. I the domains->certificate tab i get the confirmation “Great you are using a valid letsencrypt certificate”

I have ran the diagnostics and a few warnings show up that i have included here. I also installed the self-certifcate again using this command yunohost domain cert install mydomain.co.uk --self-signed --force and then reapplied the letsencrypt certificate to see if that would help but it didn’t.

Any ideas, what to try next ?

Thanks