How to sync a second time
Start a second sync by choosing Sync Now from the (Sync status) menu.
If you don't have a menu on your menu bar, you can activate it by opening iSync (in the Applications folder), choosing iSync Preferences from the iSync menu, then checking "Show status in menu bar".
Syncing a second time will ensure that the changes you selected are picked up by all of your devices.
Tip: Sync from the menu because this includes a MobileMe sync, too, which iSync's Sync Devices feature does not.