it's likely due to a setting called "Notification Reminder" which can be causing duplicate notifications; to fix this, go to your phone's Settings > Notifications > Advanced Settings and toggle off "Notification Reminder"
I also found on samsung community this solution from a few years ago-
go into the main app folder (not the Secure Folder) and uninstall the app. You will be left with only one copy of the app in the Secure Folder.
