Most likely, you use different accounts in the app and in the web version. You can compare ID of your accounts as follows:
- Enter your profile in the app and scroll down. At the bottom you will see your ID.
- Open your account page in your browser. Your ID can be found in the link to the page and on the page itself.
After you compared the ID, please authorize in the necessary account on every device you will use to study. If needed, you can delete the spare account.