There are a lot of reasons why this could happen. If the certificate of the website that you try to visit appears on the CRL list, it means it has been revoked and the issuer no longer trusts it. A Certificate Revocation List (CRL) is a list of revoked certificates that is used to determine if the current certificate is still trusted. It establishes trust between the browser and the websites that you are visiting. A certificate works in a similar way to a physical document.
