As I mentioned I have no idea what was meant by when OP said the interview was a while ago. That could mean it was November or that could mean 7 days ago. Perhaps if the OP defined “a while ago” that changes whether this is a backlog situation or a potential miss situation. My son’s application for a school showed something missing on his portal though it had shown downloaded by the school on gateway. We gave it a week before contacting the school which they told us right then and there that they did in fact have it, that the portal update was missed, and they would update his portal. It could be something as simple as this.
If OP waited until the around the deadline to do an interview, yes, things can be just lagging behind but if this was truly something done some time ago, then the potential for this piece to have been overlooked is real and the longer you wait before it can be investigated the longer your app sits in the incomplete pile. Maybe the interviewer never turned in the record, maybe it got recorded incorrectly in another student’s file. Anything is possible if it has truly been “a while ago”.
But by all means, take the advice of people telling you to wait around if you truly did your interview “a while ago” and want to risk your application. But if you did your interview last week or even this month or around Christening, yes, you’re likely going to be waiting through the backlog for that to be updated.