This has happened to me a few times: the name of a villager will randomly change to that of the villager before or after them in the order. I just happen to notice it as I flip through the group in the details screen, one villager's name is now that of one of the villagers on other side of them in the order. I haven't noticed any corresponding event or issue to signal it happening.

I've noticed it at least 3 or 4 times now. Has anyone else encountered this?