Grandad:
If you still have not resolved your custom column issue by totally deleting that custom column, restarting Calibre, creating it again, restarting Calibre, and testing the results, you could optionally try this:
[1] Install the Job Spy plug-in (at least temporarily).
[2] Restart Calibre.
[3] Click through the menu path shown in my prior post (that has a picture of the Job Spy menus) so that you execute the special technical custom column report that is displayed in that post.
[4] Make a screen-print of that report.
[5] Post that screen-print back in this thread so we can look at it.
[6] Uninstall the Job Spy plug-in (unless you wish to keep it for a while).
DaltonST
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