DNS zone file not presenting correctly

Running DNS on a Windows 2000 server. Internal seems fine. Hosting a web site at Interland.com

I updated web page called opps.htm yesterday. When I browse to site from our network http://www.ksninc.com/jobs/opps.htm old version comes up. When I browse to site from our network http://ksninc.com/jobs/opps.htm proper version comes up. If I browse to ether site outside our network both show proper pages. ? ?