Ssl certificate and this site is not

I added the free SSL cert a few weeks ago. Seemed to work fine, but then I spotted that if I click on the website link from email, it starts to open the page and then gives a “certificate error https://mywebsite…” and 'This Site is Not Secure."

If I just load the site in the (same) browser the certificate is valid,

The “invalid” certificate has a different issuer and valid dates - sni.dreamhost.com, valid until 2025 as opposed to the “valid” certificate issuer is Lets Encrypt Authority and only valid until October this year.

Any ideas?

Thanks and regards

My error. The email link had a full-stop at the end (which was grammatically correct) but led to the result above when clicked.