Hi neighbors! This should not be happening unless you are using a smart watch or Rich notifications. As described in our Community post about Rich Text Notifications, if you have a smart watch, such as an Apple Watch, with your Ring app connected to it, these notifications may show as multiple alerts for the same event and may include Rich Notification snapshots.
Another culprit for multiple notifications is device linking and integrations. Please check your Ring device settings in the Ring app to confirm they are not linked with other Ring devices or, perhaps, using an integration that might be extending your notifications. Otherwise, this should not be happening, and I recommend removing and reinstalling the Ring app to see if this resolves the concern.
If this concern is persisting, please give our support team a call at one of the numbers available here. If you are outside of the US, please visit here to see how to contact support.