This may seem kind of obvious, but have you checked if you have write
permissions to those files?
From the image, I see that these "zombie" pictures are part of the "Unknown"
tag (meaning that digikam has detected faces but they have not been
identified/recognized), which is a special tag in digikam and might not
reflect changes from the filesystem.
Can you make sure that these pictures are still in the filesystem? If they
aren't, I guess you can just delete them from the Unknown list.
--
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http://digikam.1695700.n4.nabble.com/digikam-users-f1735189.html