If more than one student is logging into the same device - PC or iOS device, make sure each student logs out properly (Click link for logout procedure).
You may also need to clear the browsing history/cache before the second student can log in successfully and see their courses - or the second student may need to log in by using a different browser (Edge instead Chrome, for example).
Clearing the Cache:
- Google Chrome
- Microsoft Edge
- Safari on mobile devices on Mac
- PC World: How to Clear Your Cache on Any Browser