[Koha] why do i get a Duplicate Record suspected message while adding records while there is no similariyty between the books in content or name or author or copy number

[tanzeem]

Hi
I get a Duplicate Record suspected message
 while adding records while there is no similarity between the books in
content or name or author or copy number
or DDC no or keywords,or publisher or keywords.
When i was adding the record for Dermatology and sexually transmitted
Diseases book
I get the message
Is this a duplicate of Adolescent medicine today?

How does this show up?Any idea anyone.
I know that i may be able to skip this by clicking the button >No, Save as
New Record

But i want to know why Koha shows this message



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