Hey - these can be caused by a number of things that aren’t related to the alarm app. If you have any reminders set in other apps, such as health apps like water hydration, game apps such as goal/gift reminders or any apps that run tasks at set times - these can all cause the alarm to show as set.
If you’re unsure which app could be causing it, wait until 9am and check if you receive a notification from an app.