It's possible that one source says "John Doe" was born in 1966 and another says that he was born "May 1st, 1966". Currently the UI per default shows both of those claims. I think it would be helpful if there would be a toggle to collapse the claims and show the information together.
The same goes for one source saying that a person was born in Chicago and another saying the person was born in Illinois. Given that Chicago is in Illinois it's would be easy to collapse the two claims and only show that the person is born in Illinois.
This would allow to accurate represent what the sources say but not have a mess with duplicated claims.