A few of our iOS customers are experiencing a glitch with the Canvas App where their push notifications are reset to be "on" for everything. Changing the settings in the App or in a desktop browser changes things temporarily, but next time the app is opened they are all ON again!
The only fix seems to be removing the App and reinstalling it with push notifications off. We submitted a case with Instructure, but the technician had not heard of the issue.
iOS Canvas App v 3.17.2
iOS version 10.2.1