IBM Product Manager interview questions

had a very good round of initial interview and I was expecting to be shortlisted for the 2nd round - but unfortunately I heard that my interview response was negative. I'm really unsure of what could have happened to mark it as "negative" - I'm confused!! I was asked about generic PM practices, they heard about my projects, they explained about their position being interviewed for and also asked me about my notice period... by the time you think you will hear back positively from them… astonishingly it was negative!