Hey! I was also interviewed for History and Politics and one of my interviews was a little bit like this. I wouldn't say that the interviewers were lacking in energy (they actually seemed interested), but the questions themselves were very general. I actually found it hard to answer sometimes, because the questions didn't allow me to give any meaningful or thoughtful answers, and everything I did say felt rehearsed. In addition, the interviewers also barely asked any follow-up questions.
I definitely don't think of it as a bad experience (still enjoyed it and the interviewers were very patient/friendly), but I thought my first interview was way better as it was more challenging, interesting and conversational. I honestly have no idea what it means for your application, but just wanted to say this to let you know you're not the only one who had this experience.