Another possibility:
Look at the status line. That can hint if there is some sort of filtered view in force.
The first is the Restricted view count. If there is one. note the [ ]
This (my sample view) next is the number of books selected (highlighted)
The last count is the Total Calibre Entries (lines in the grid view)
The delay (restarting Calibre) for them to appear, makes me think the Library was created in a system default 'cloud copy' folder (might have been added upgraded by some OS update )
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