Quiz review settings are set to prevent quiz review after the quiz closes. When the student attempts the quiz on the app, they can still review it after the quiz is closed. It appears to be a caching issue within the app. If you review a quiz that wasn't done in the app, you are unable to review it as expected.
Edit an existing Quiz or create a new one
Enable Open the Quiz and Close the Quiz
Set whatever dates/time (keep short for testing purposes)
Expand Review Options
Under 'After the quiz is closed' uncheck all except Marks (or points) and Overall Feedback
Save and return to course
Launch the Moodle App
Log in using a student account that is enrolled in the same course as the quiz
Access the course under My Courses
Locate the quiz
Attempt the quiz
Wait for the quiz to close
Expected results: Quiz cannot be reviewed
Observed results: Quiz can be reviewed
If you access a quiz that you did on a computer, you won't be able to review it in the Moodle app, as expected based on the Review Option settings.