Royal title stays “King of Sulani” while living in Del Sol Valley

My Sim is King and currently lives in Del Sol Valley, but his title still says “King of Sulani.” He only lived in Sulani briefly and owns a small business venue there. When I move him to Willow Creek, the title correctly changes to “King of Willow Creek,” but in Del Sol Valley it remains stuck on Sulani. The title does not update to “King of Del Sol Valley.”