If you cannot see your notes on the app and want to restore them from the iCloud, you can easily do so by disabling and re-enabling iCloud right from the Noteshelf app.
1. Tap on the Gear icon
2. Tap on Cloud & Backup
3. Turn off the 'Use iCloud' switch
4. Select the 'Keep on my device' option (as shown in the attached screenshot) so the data will be stored locally on your iPad.
We hope this helps. Happy note-taking!