When I first click on the My Library link, the All bookmarks list comes up in an unknown order (Doesn't appear to match any of the displayed columns).
You can resort by certain columns by clicking the sort order, and reverse the order by clicking it a second time.
All of the sortable columns, except for Story Name, give you the same order first whether you are in the default order or if you have already sorted by a different column.
For Story Name, you get Descending first if it's currently the default sort and ascending first if you have already resorted on a different column.