Files Queued for Reverification (IM 7.1 and 7.5 )

I have a very simple question; Why would files be queued for re-verification? I posted a topic the other dxay about dealing with ImageManager retention issues (Retention Failure/Deferment Issues) and it seems that the source may be image file re-verification after daily processing. However, why would that be? If the files verify the fisrt time, What would cause the need for re-verification?

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