Password problem after deleting second user on iPad

Hi,

  1. I setup 2 users on my iPad, everything worked fine.
  2. I deleted the 2nd user from my iPad.
  3. I could no longer login as the remaining user, I got a ‘wrong password’ message.
  4. I deleted the remaining user and re-added, everything worked fine again.

Is the password being corrupted, is the wrong password being deleted?

Thanks
Simon