Night time sleep marked as nap. How do I fix this?

Last night was the first time we used the sleep analysis feature of the app. It recorded our babies night time sleep between 8:28 pm - 11:31 pm as a nap. She woke up to take a bottle around 11:31 pm and was put back to bed around 12:30 am. It counted only her sleep 12:30 am onwards as night