You can re arrange all folders/layout if you in Layout Mode click on Handle in Status Bar upper right corner and then Layouts...
Re-arranging isn't the problem. We always re-arrange them to the way they are supposed to be, but then if we edit a layout, they get automatically re-arranged back.
I tried creating a new folder, putting the layouts in there, and deleting the old folder. That seems to have worked.
Sounds very much like you have a corrupt file. Try to Revover the file