Certbot not showing all the domains

Actually I guess not, but the domain name is not valid; DNS GIGO

$ nslookup mateon_sl.mateon.eu dns1.registrar-servers.com.
Server:         dns1.registrar-servers.com.
Address:        156.154.132.200#53

mateon_sl.mateon.eu     canonical name = mateon.eu.
Name:   mateon.eu
Address: 75.119.144.237
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