ProSTEM interview questions

I was invited to join 2 interviews. The first one was an HR interview, and the second one was the user and offering letter. HR interview took around 30 minute, which mostly discussed about the job description first, and then the HR interviewed me about myself, my personality, previous experiences and skills, and moreover about my preference of what kind of company that I wish I could join. Overall the interview was a good experience for me, but the second interview was kind of unexpected because it's suddenly talked about offering letter. Oh, in this interview, I also asked about the psychological test result and then continued to talked about the offer.