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					Originally Posted by  badgoodDeb
					 
				 
				"Ghost books" --  see this thread,  particularly posts 7 and 8  (which in turn points to another thread).     I found collection updating was not happy when I changed the title of a book with Calibre.  It then turned the book into a "ghost book" -  present only when explicitly searched for, but not otherwise visible.  (At least, not in Collections View).   This might be related to what you describe..  
			
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 Barryem gave me a fix in post #190 but I'll keep your info in mind when I'm changing titles in calibre, (which I do for series so that they appear in sequence order in a Kindle collection. Now that would be a welcome firmware update: a Kindle that knows about book series numbering.)
Reading other related posts it seems to be how the user interprets the font weight of "All" vs "Downloaded".