Problem with resolution

[Baird, Josh]

Hi,

Does anyone see anything strange about the two hosts?

www.ca.greattextbookgiveaway.com
www.sorteodelibrospucmm.com.do

My BIND 9.9.4 servers are unable to resolve these hosts, but I have older servers that can.  I noticed that I am unable to resolve the two authoritative servers (ns1.500bucksaday.com/ns2.500bucksaday.com) from anywhere (http://pastebin.com/kHUYHqDc), yet I am still able to resolve the two above hosts from several locations.

Dig from server that can resolve the hostnames:  http://pastebin.com/CYWCMdLn
Dig from server that cannot resolve the hostnames:  http://pastebin.com/EepCFyh9

Thanks,

Josh