ssl – Nginx is serving a different certificate to Firefox than Chrome

When I go to my domain pms.abovehotels.com/ with Firefox, I am presented with the warning:

Firefox does not trust this site because it uses a certificate that is not valid for pms.abovehotels.com. The certificate is only valid for fish.multiwebinc.com.

Viewing the certificate information shows:

Common Name: fish.multiwebinc.com
Not Before: Thu, 11 Jul 2024 19:03:08 GMT
Not After: Wed, 09 Oct 2024 19:03:07 GMT

Opening the same site in Chrome shows no errors and it looks like a totally different certificate:

Common Name (CN): abovehotels.com
Issued On: Sunday, August 18, 2024 at 10:35:45 PM
Expires On: Saturday, November 16, 2024 at 10:35:44 PM

Both certificates were generated with Let’s Encrypt. The web server is Nginx. What could be causing a different certificate to be used for Firefox? Has Firefox deprecated the type of certificates it accepts and it is defaulting to a different certificate?

The nginx.conf file has:

http {
  ssl_protocols TLSv1 TLSv1.1 TLSv1.2 TLSv1.3; # Dropping SSLv3, ref: POODLE
  ssl_prefer_server_ciphers on;
}