The whole point of Notification Center, Apple's always-accessible alert drop-down, is to make it easier find and stay up to date on the information that matters the most to you. By default, Notification Center will list app alerts in the order in which the app was installed. You can take control of notification handling on your iPhone or iPad, however, and organizing alerts and notifications in a way that makes the most sense to you, either by time and date, or by whatever order you wish.
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