You have two display orders for your collections :
The Display Order changes the display of your collections for your view only in your "My Images" page - this is managed from the collection information page (Default 5000 will display in alpha-numeric order)
The Sort Order changes the sort order of your collections for your web site visitors in the Client Area page - this is managed from the edit view of the Client Area page. From the collection information page, go to the access rights and click the name of the page next to the gallery image.
Default 3000 will display newest collections first