What led me to discovering this discrepancy is that a.) I have no other format than ePub. and b.) the library icon at the top showed one number, and the format category in the tag browser showed 4 less. Clicking once again on the format category to change to a minus sign (meaning false) revealed the four books. They indeed had covers, and they had opf files but the epub was gone. Only one was something I cared to have, so it was no big loss. As I have been pruning madly I have found others also. But they got deleted as I went along to add covers etc. So I guess four is no big deal after all.
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