Meta Software Engineer interview questions

I applied online through Linkedin and got an email from a FB recruiter asking whether we can arrange sometime to talk on phone. We then had a quick talk on phone about what I was doing, what I had done related to software development, and how was an interview process with FB. Then he said he will arrange a phone interview for me. The first phone interviewer was nice and I can answer the question easily although I did not understand the question correctly. But he was very patient explaining it to me and I finally did it right. After a week I received an email from the recruiter saying that the response to the first interview was positive and they wanted to schedule another phone interview. The second phone interview was a week later with a Chinese girl who did not sound friendly or enthusiastic but with a cold voice. I felt that she did not like me and would not want me to be in FB since the beginning of the interview. This made me very nervous and confused, and I lost my confidence. Hence, even though the question was quite simple but I did not do it well. I can guess what happen next: I got a "thanks from FB" the day after.