Sometimes, when users click Android's Back button to exit an app, the app exits, but a previously loaded app will suddenly start running (even though the user launched the current app directly from the launcher).
Is there a solution to fix this?
In the comments below, a specific example was requested...
Here is a specific example from a friend's device: He is running Lightning Launcher on Android KitKat. He will play Sky Force 2014 and then after playing for a while, will launch another app to do something else. When he exits the other app (happens with various apps) by pressing Android's Back button, Sky Force 2014 loads up again.