I have had several duplicate name changes. One of my villagers died with the name Micheal Ross, and Micheal Ross was a girl. And Micheal Ross was still alive. The name was either just behind him or infront of him that had the same name. I think it also duplicated the skills.
I started going through the names and righting the dupicated villagers.
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You cannot do a kindness too soon, for you never know how soon it will be too late.