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If you have books or other information missing from your library, there could be more than one reason for this - but an update is certainly not one of them.
First, are you sure the current library is your only one and you have not created other libraries in the past? Second, is your library on a cloud or a network drive or is a syncing program running in the background when Calibre is open? Third, have you deleted/added/moved anything directly from/to the library folder, without going through the calibre GUI?
Those three are the most common culprits for missing books and other irregularities.
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