@Laura - I think DJM is referring to 'Recipes' under 'My Bookshelf'; by default, the recipes appear with the most recently added at the top.
@Jane - DJM's question is why are Silver Palate recipes appearing now, since the book has been indexed for a long time. I believe that the answer is that page numbers are being added, and possibly some revision to the indexing (much has changed since the earliest books in the EYB Library were indexed, and a close look can motivate re-indexing).
I had noticed the same thing as DJM, and went to look at the recipes in the book view of Silver Palate; at that point the page numbering had gotten to about page 220, with subsequent recipes page-numberless. Edits by pro indexers to already-indexed recipes appear as they are made, not all at once like indexing by members that's released after review.