Missing victim of the maniac (Red Dead Redemption 2)

The people, help pliz, someone faced a problem - how to solve it?

In General, found the first victim under a railway bridge in Valentine. Had already found the second body on the rocks near the station Vallance, but I ignored it and took the map. In General, when he reached the 6th Chapter, I still returned to Valentine, took the card from the victim under a railway bridge, and when he reached the stones at the station Vallance, and there saw only the blood on the stones, and the body and the victim's head is missing...

What to do? Why it happened and where I now take a second piece of card?
Thanks in advance!