I’m frustrated

I've tried combining ancestors' records but I can't link "unknown name" to the name of the ancestor.

My ancestor 9FMK-HPW Johann Heinrich Hausman is linked to his birth family, but pedigree with details says "unknown name" on the pedigree and as a child of his parents to the left of the pedigree. When I click on "unknown name", Johann Heinrich Hausman comes up. Why? Also, his wife and children are not listed with him when 9FMK-HPW is his PID. I have tried and tried to combine his records but nFS says there no other duplicates. I know there are duplicates because I put my ancestor in with the name "Henry Housman". It's the same person. Why can't I combine them. Why can't I get rid of "Unknown name"
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