It looks like a DNS server for our ISP has a mistaken record for that IP. I've contacted them - stay tuned.
UPDATE
Okay, it's looking like our ISP does not run that DNS server. Furthermore, the changes have propagated as a result of an authoritative nameserver record showing an A record pointing to your IP. The only way to remove it is to get the authoritative nameserver to remove that record.
Both domains have GoDaddy nameservers. I suggest contacting GoDaddy and asking them to remove those records.