Hello @KenzieBallweg
I assume that you were able to resolve this issue by now...but if not, there is a reason as to why this would be happening.
This can typically happen if you have deleted the app and reinstalled it a few times. You will also see this if you have signed in on the app from different mobile devices. When you sign into Canvas on the mobile app, an access tokens is generated for you and they never actually expire. The 4 notifications that are being pushed out to you each time are most likely due to there being 4 API access tokens registered to your account.
To correct the issue, completely sign out of the application on your mobile device. From there, log into Canvas on a computer using the browser. You will just need to remove all of your API access tokens for the Canvas mobile app on a browser. You can access these tokens by clicking on the Account button and selecting Settings. The access tokens are located under the Approved integrations area of your account settings page. Once you delete those tokens, you can sign in again on the app from your mobile device and it will assign a brand new token to you for the push notifications you wish to receive.
Hopefully this helps! Sorry for the confusion on that!
-Colton