[webmin-l] wrong let's encrypt certificate served

I recently added a domain to a server which had a "proper" ssl certificate
installed (I transferred the domain from another server).

when I gave the domain the shared IP which is used by other servers with
let's encrypt certificates, I got served the first certificate from let's
encypt (domain with an A, here a-achat.com, so it looks like it is the
first alphabetically).

Ok,I thought, give the domain a let's encrypt certificate, but this doesn't
work either, I still get:

This server could not prove that it is kosmotique.org; its security
certificate is from a-achat.com. This may be caused by a misconfiguration
or an attacker intercepting your connection.

the domains in question is:

https://kosmotique.org which brings:
https://www.sslshopper.com/ssl-checker.html#hostname=kosmotique.org

bug or a mistake on my side?

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