This happened to us - For the K-1 visa, in the process from NVC to Embassy to Interview, the status in CEAC will say "Immigrant Visa" because for the paperwork needed and the medical needed it is treated like an immigrant visa. Once the Consular Officer approves it at the interview, since it is technically a Non-Immigrant visa, they have to change the status to "Non-Immigrant Visa" and "Application Received" when they pass it to the Non-Immigrant Visa Section to actually process and print the visa. Do not worry, we went through this same thing and a day or two after that happened, our status changed to "Issued". My guess is it will show an updated status very soon.