There are two editions of Feast of Veg in the EYB Library. But they could only both appear on your Bookshelf if you added them both. When you add an edition to your Bookshelf, only that ISBN/edition gets added - it doesn't matter how many editions it has. You can delete the edition you don't own by clicking on the check/tick mark under the book details - when you hover over the check/tick you see a pop-up saying Remove. You can also remove a book on the book details page, at the top, again by clicking the check/tick Bookshelf.