This probably means your server configuration file have some old reference to the old certificate file. If you use Nginx, try sudo nginx -T and search for the certificate file. If you use Apache, try sudo apachectl -S
Have you tried to follow the instructions from Bitnami on this issue? Im not sure which acme client you use to configure the server, but looks like the server didn't apply the certificate (or didn't pickup the certificate via reload).
I would say to try install the certificate again (Install, do not reissue). And, the most important thing is, check if you run the commands in the wrong server.
It is weird: I have 3 different instances, each of one associated to a different domain.
One domain is emprendemy.com, and it has a valid certificate until May 2. But when I run sudo openssl x509 -noout -dates -in /etc/letsencrypt/live/emprendemy.com/cert.pem to check the valid dates, I have different dates and no one shows May 2
So I run sudo certbot delete --cert-name emprendemy.com on the 3 instances (just to be sure) to delete all certificates associated to that domain, and the SSL is still there.
I cannot find WHERE is that certificate issued. Is there a way to understand where did I make that certificate?