Have you experienced that your home pages shifted? This thing happened to me recently that's why I find out a reason why it changed without my knowledge and how can I bring it back to it's original position. If we haven't set the screen lock option, the tendency is that we unknowingly made an action that can change some of the default settings we have on our phone.
To bring back the orders of your home pages,
tap the menu key
Hold the page that you want to move,
wait until you felt that your phone vibrate
and drag it now to your desired position.