HASHSTACS Full Stack Developer interview questions

Two rounds of interviews. One technical and another behavioral. First, in the technical round, I got interviewed by two software engineers on the team. They were very nice and made me feel comfortable answering all the questions. They try to urge me to answer the questions to the best of my abilities and I can tell they wanted me to pass it. I did not hear back from there for like 2 weeks. So, HR processing was very slow. For the last round, which is behavioral, I had a chill talk with one of the higher-ups or so I thought. I did not ask many questions as I have already done so in the previous interview and there were a lot of repeat questions thrown back and forth. I don't really see a point in this round. Maybe the guy did not like me or he thinks I lack enthusiasm but I thought it was quite strange that I was rejected. If you want to pass the interview, I guess you will have to focus on the behavioral round also. I am grateful for the opportunity the technical team gave me but sadly I did not make it.