It's not a problem but a little bit funny ;D
See screenshots...
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Yes, I believe I submitted a bug report about this a few weeks ago. For me it happens when I add or update files to the database. Instead of the counter resetting back to zero after the updating is done, if you add or update more files during the same session the counter begins at the count where it left off the time before.
This has already been reported as
https://www.photools.com/community/index.php?topic=619.0