Joolz Thank you for chosing Tonfotos!
Joolz (a) should these duplicates have been created?
If you checked that box, then they should not. However, files are not considered as duplicates if they are not exact copies. Editing metadata might be the reason files are not exact copies anymore.
(b) does the “Ignore” duplicates check button work opposite to how I’ve interpreted it?
I don’t think so. I guess metadata editing was the reason.
© having imported these duplicates should I have run the Remove Duplicates routine rather than deleting them manually?
You can. However, if files are not exact copies, it will not help.
Please check this page: https://tonfotos.com/docs/duplicates/#what-is-a-duplicate