Cisco Systems Engineer interview questions

Went to four rounds of interview: hiring manage, peers, and on-site with multiple interviewers. I applied through an university career site, received the a contacts in ~3months. Then, I was scheduled to interview with a HM which gone over various background, few technical questions follow with another phone interview with a peer. Finally, 2 weeks later, receive another invite for an onsite.

Actually I had a nice interview, at the end they said that, I passed the first step but it does not mean directly they want me in 2. step and they choose only the best interviewers. After 3 days I got another call from another person she said that the position is not available anymore and offered another one. I accepted the offer, however they did not get in touch in the past 6 weeks.