Two "valid" SSL certificates, so site does not work on mobile

[wackyblackie]

Your website is working fine for me in Firefox.

You can remove the incorrect certificate from your website through the “SSL/TLS” section in cPanel and then add the right one.

Also, please note:

@wackyblackie

[In September 2021] the DST Root CA X3 expired and thus some caused trouble. However, all certificates now should be using the ISRG Root X1. Try clicking the “Certificate Information” and look for DST Root CA X3. You can read more here:

letsencrypt.org

But that was about 5 months ago now, so unless you are using an unsupported, non-updated device, you should be fine.