Just couple of days back I attended Amazon OA, two questions, 90 mins and then Behavioural questions.

Was able to solve both the problems with all test cases passing and then give the behavioural assessment which was also gone good in my opinion. But when I took update from the recruiter, he said that I have not cleared the online assessment round now, why could be this? Anybody have any idea why someone will get rejected even they solve the given problems fully?