[stumped]

this came about when testing the latest CC amazon beta but it may not be a CC issue.
not sure now to continue the troubleshoot...

last night I wanted a .mobi book from my library for CC testing. library PC was sleeping so I was using CC with my dropbox mirror
i found a book where metatdata says I have epub and mobi formats. but download option only offered me epub. i check the actual dropbox folder and sure enough, all i have is epub, opf, and cover.jpg

so this morning I ran calibre library check - which says all is good. no missing formats - and when I find that same book in calibre, the details pane says that I only have epub.
CC agrees, when connected to content server, but CC insists I also still have mobi when connected to dropbox mirror

I re-ran the file sync, I check that the sync is not set to excluded anything.
my library mirror has the same number of library files and folders as my library source.
5637 files in 2200 folders

but cc connected to cloud still says in book details that I also have the mobi format of this test book- WHY ?
it shows format: EPUB, MOBI
i guess it is reading available formats from the .db file so how come it is getting a different answer

update. i found another instance when CC with cloud metadata details says a book is available in AZW3 and EPUB, but calibre says only in EPUB, as does CC with content server

update: more tests. that was happening with a new install of a CC beta, after uninstalling prev. version
so I tried a different tablet which has the latest non-beta CC I found both those same discrepancies where CC with cloud sees 2 formats for those 2 test books, but only 1 really exists. and CC with content server gets it right.

i cannot go any further without knowing how CC populates the book details result after you connect, select a book and choose metadata from the metadata or download option

also I can't think of any way to see how many such "errors" exist across the library as CC will not count books by formats to give me stats for comparison