NPC appearance doesn't necessarily correlate to their actual racial clan lore-wise. Examples:
  • F'lhaminn is a Seeker with a Keeper appearance, as is the mama of the M tribe at the Peering stones.
  • Papalymo was a Dunesfolk (confirmed by Lorebook which mentions it several times so no error here) with a Plainsfolk appearance.
  • We all know about Minfilia and Yda/Lyse being Highlanders in terms of lore, despite their Midlander-looking features.
  • Jandelaine and some other Ishgardian nobles, esp. those related to House Dzemael, are Duskwight in terms of appearance data, but this doesn't mean they've ever been anywhere near a Gelmorran cave.
  • Some Hellsguard are missing the mark on the nose, while some Sea Wolves have it. Additionally, several Roegadyn NPCs use the naming conventions typically associated with the opposite clan.
Members of any race may exhibit unusual features usually attributed to another clan, but this doesn't mean that they are actually members of that different clan. It displays a bit of realistic variation - recessive genes showing up through a chance of breeding, traits inherited from crossbreeding a generation or so ago, or even exceedingly rare random mutations are all things that can happen in Eorzea. Don't read too much into appearance data files.

For example, in-lore a Wildwood's allowed to get Duskwight tattoos if he for some reason wants to, and a Duskwight's allowed to wear colourful Wildwood ear-clasps, even though these things aren't possible in our character creation.