Just a little curios as to why

My Firefox browser indicates that   https://www.bitcoin.cz/       is not signing it's certificate.

www.bitcoin.cz uses an invalid security certificate. The certificate is not trusted because it is self-signed. The certificate is only valid for *.*.webera.cz (Error code: sec_error_untrusted_issuer)

My Firefox browser indicates that   http://www.bitcoin.cz/   redirects to      http://blog.bitcoin.cz/

My Firefox browser indicates that   https://mining.bitcoin.cz/ goes to BitcoinCZ  Mining aka Slushes fund webpage


My Firefox browser indicates that   https://bitcoin.cz/            is a 403 Forbidden


Is it not odd that https://www.bitcoin.cz/  is not signing it's certificate BUT  https://mining.bitcoin.cz/ seems to get me where I want to go? Shouldn't there at least be a re-direct from https://www.bitcoin.cz/ ?? I mean it is still the same domain