There are religious reasons why some Cohanim lose their Cohen status.  Interestingly my father was an Israel, but when I had two paternal "second" cousins DNA done, I was asked after the first one was done whether we were Kohanim.  Then when the second Y test came back, I knew.  My paternal great grandfather had married a woman with children - including a son (and while they may not have set out to hide that her two children were not his), it happened because the blended family was raised as one family.   Since they did not want to distinguish that Aaron Jacob ("Jack") was an Israel while Henry was a Kohen - everyone became Israel.
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Sarah L Meyer
Georgetown TX
ANK(I)ER, BIGOS, KARMELEK, PERLSTADT, STOKFISZ, SZPIL(T)BAUM, Poland
BIRGARDOVSKY, EDELBERG, HITE (CHAIT), PERCHIK Russia (southern Ukraine) and some Latvia or Lithuania
https://www.sarahsgenies.com