Home screen is moving about in iOS7
There are one of three things going on here.  I'm not sure which is most likely.


You have long-pressed an app icon and entered into the move/delete mode where you can adjust locations and remove apps.  To get out of this, click home.
You are experiencing the parallax effect of the home screen.  You can turn this off in Settings&gt;General&gt;Accessibility&gt;Reduce Motion *On*
You are trying to be funny.  Stop that.