Vanguard Brokerage Associate interview questions

I received an on-site interview after talking to Vanguard at my university's job fair. The interview was 2 on 1. Most of the questions they asked me were behavorial. A couple questions were to see if I had a basic knowledge of the stock market. The interview took about 30 minutes. I was told I would hear back at the end of the week even if I was declined. I received no call back and the week after I contacted them and was told I was declined.

Applied, phone interview with recruiter, 2 1-on-1s with managers for about 30min..offer 3 days later