Duplicates not being recognised as duplicates

Would anyone be able to assist with duplicates in a Zotero Library which are not being recognised as duplicates?

The screenshots below show the duplicate entries which do not appear in the duplicate items collection folder. The only difference I can see is that the second entry has the word (first) after the author details. Could this be why this is not being picked up as a duplicate entry? These records have been manually added so I am unsure why the word (first) has been added after the author name:



There are many other duplicate records in this library that are also not being picked up as duplicates, possibly for the same reason as one of the duplicate records has the word (first) in brackets after the author name.

Thank you for any suggestions or advice.
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