You should have an authority section that looks like this:
Code:
;; AUTHORITY SECTION:
ucar.edu. 172800 IN NS dns.ucar.edu.
ucar.edu. 172800 IN NS dns2.itd.umich.edu.
ucar.edu. 172800 IN NS dnsx1.ucar.edu.
ucar.edu. 172800 IN NS dnsx2.ucar.edu.
Looks like afilias-nst.info is attempting to claim authority where it shouldn't? Sounds like your ISP is redirecting dns, too, if you get that no matter what dns server you use.
Edit - If you can, install dnstracer and run something like dnstracer -s <dns_server> -4 ftp.usa.openbsd.org and post the results. Scratch the stuff about afilias-nst.info, that appears to be an upstream dns server from openbsd.org.