This not only happens when you switch apps. If you are in a meeting taking notes and you stop for a couple of minutes then when you go to start taking notes again the note refreshes and goes to the top of the note. I have had to stop using Evernote on my iPad for note taking in meetings. This has been an issue for many months and I keep getting told a fix is on its way but there have been several iOS app updates and still it is not fixed.