Guide books provided by Modopedia don't show up properly in EMI.
Concrete example would be Enchanted: Witchcraft's Art of Witchcraft book. It does show up in the Creative menu, but not in EMI. When searching for @modopedia the book does show up, but not with the right name:

The Enchanted dev said it's likely an issue with EMI and to open a ticket here Favouriteless/Enchanted#101 (comment)