1. When you re-point your domain at non-NetSol servers, they momentarily point toward a server that in turn says your A record is their "business profile" default landing page. It takes a few minutes before pointing correctly at your new name server
2. Many large caching nameservers don't obey TTL; our SOA's TTL was 7200, or 3 hours, but we saw servers at RCN, BellSouth and Cox serving our old SOA nearly 24 hours later.
Together, that means that for 24 hours, some people got this lovely page: http://www.vttcorp.com/ instead of our server.