How did you configure the mirroring? How are the websites organized at DreamHost? The DNS for one of the domain is managed by Bluehost, another by hover.com ... I'm not sure what's going on.
mirror in DreamHost panel is a DNS alias: since DreamHost doesn't manage those DNS records I am not sure how it can do any mirroring at all... The KB article I linked says:
You must ensure that the DNS records for the domain that is mirroring the real website points to DreamHost.
but I'm not super familiar with that functionality either so
More details, please?