And now you've provided us with some the answers we were looking for that would allow us to have the full picture of the situation (except for your Outlook version, which you never mentioned).
Unfortunately, I have no solution to offer. I have never seen or heard of such behavior from the standard contact form. As a long shot, you can try clearing the forms cache -- Tools | Options | Other | Advanced Options | Custom Forms | Manage Forms | Clear Cache -- but I doubt that it will help.
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Sue Mosher, Outlook MVP
Author of Configuring Microsoft Outlook 2003
and Microsoft Outlook Programming - Jumpstart for
Administrators, Power Users, and Developers