hi, my harvard one was ok, but my one of my yale one's was like that... and it wasn't just my imagination either because i interviewed at like 10 schools and they were all fine and everyone was really nice and conversational, but one of the yale ones confronted nearly everything i said with a new situation and said that sometimes people who are interested in alot of health policy (which I am) shouldn't be doctors, they should choose another career, like doctors shouldn't be concerned about anything other than just symptoms and meds or something.... you never know the type of interviewer you're gonna get...
but don't worry about it, it's just the luck of the draw, everyone will have at least one semi-weird experience at the end of the process... 🙂 good luck!