The problem is with the arrangement chosen for the list view.  Using any of the following methods, choose Arrange By | None :     The View  menu from menubar  The gear icon  in the Finder  window  The contextual menu  (right + click mouse button)     The Finder in Mac OS X  is the application is always running and provides access to the file system of the computer.  This is the Windows Explorer  on Windows  systems, or something like Nautilus  on Gnome -based Linux  systems.  The primary interface is a folder paradigm that presents files and folders in a number of different views.   On the Mac, these views are icons, list, columns, and Cover Flow .  To the Finder, the list view is a "stacked" presentation of the files with alternating background colors and a nice feature Apple  calls a " disclosure triangle ."  This control is present on directory items, and when clicked, will either expand the listing to show a nested view of the contents of that folder or...
A little commentary about the world of
technology and programming.  No "holy wars,"
or ideological rants, just posts about tech
news and other findings from around various
places.