"File doesn't have a checksum yet" log message after successful Check File Integrity

I have four indexed databases. When I do File > Check File Integrity on them they all report “Successfully verified integrity of XXXX files”, but one them also reports "File doesn’t have a checksum yet against eight files (out of 1584).

Do I need to be concerned about this and How would I fix it?

Thanks

It’s possible that the calculation of the checksum of these items is still queued or that the indexed files are not available or missing. Does closing & opening the database again fix this?

It does !
Thanks