If the app is not working properly, you can try the following:

1. Close the app (swipe it from cache memory) and reopen it.
2. Log out, close the app and log in again. Make sure that you log in to the app with the right user account.
3. Update the app to the newest version.
4. Delete the app and reload it.
5. Make sure that you are logged in to the right Apple App Store / Google Play account (the one that you used for starting the subscription).