I contacted the hosting company as well and this was there response "It looks like your database is using myisam. Myisam updates a database by tables so what I believe is happening is that an entry is being updated and since that table is updated everything in that table is being marked as updated. You may want to check with a database administrator to see if there is a way around it."
Also I adjust the update page to <input type="hidden" name="fldupdated" id="fldupdated" value="" size="32" />