In the original handwritten version of the Sigil of Blahut, the name in that particular blank space was Urta.✶ Has Urta been replaced by Arkon?
Urta is another name for Arkon — it's the same individual. Urta is his given name; Arkon is his title. Arkon as a title means: the king of the Arkons. (Urta was his name before he became king.) Now, thanks to the overlooking of this fact, both the man and the king have been confined. There really are no mistakes.