Amazon Software Development Engineer interview questions

I was mainly asked a bunch of behavioral questions along with past projects and my current job. The technical/whiteboard questions were pretty easy, just have to know your data structures and algorithms. One (out of four) of the interviewers kept questioning my whiteboard work because she couldn't understand it. Which made it feel weird as to why she was interviewing me, it took like 5-10 minutes of explaining before it clicked (it was simple matrix index searching using BFS). About a week later, I got denied and told was with 6-12 months development experience under my belt they think I'd be a good fit. They knew my current position isn't dev work, so their response is a bit odd... oh well, on to the next.