Do you "exit" the app with the Home or Back key?
Home, by design (Android design) is like Windows "minimize" -- it saves an app's current state and will resume from there.
Back, by design (Android design) is fully closing, forgetting current state -- so next time it starts from a clean slate.
One other thing -- if any of your accounts have an authentication error, Aqua will start in the account list, to let the user see the error.