You’ll want to follow these instructions on the device that does have the deliveries. (See here if that’s the Mac Dashboard widget.) First make sure your internet connection is working. If you just have one delivery that isn’t syncing, tap the Edit button, tap the delivery, then tap Save—this will force it to re-sync. If you have multiple deliveries that aren’t syncing, tap the button, then tap Sync. Log out of your sync account, and then log back in. This will force all of your deliveries to re-sync. On the devices that’s missing the deliveries, you can tap or click the “Updated” text at the bottom to refresh all your deliveries immediately.