I had an interview task, a formal interview with a few panelists and then a supposedly informal interview. At the formal interview I was asked to present on my interview task. I then was asked questions related to the task and my aptitude for the role. The informal interview was billed to me as a fit interview but essentially they asked follow up questions on my interview task and responses from the formal interview. It was super weird as it was clear they weren't sure what they wanted.