Hierarchy Display

[P.Jones]

Having just discovered this I've been having a play with it in the Media Folders Panel

A Folder I have is structured like this

Raw_007
  Family
  Family Holiday
  Moon
  Sunset
  Twycross Zoo

I have the Show Hierarchy and Show all levels set as active.

But the File Window displays like it this

Raw_007
  Family Holiday
  Family
  Moon
  Sunset
  Twycross Zoo

All my other Folders display the sub folders in the correct order except for the 007 above and a few others.

Any ideas why?