IBM Data Scientist interview questions

I had 2 phone interviews and 1 aptitude test which is the IPAT. In the first interview the questions were mostly about machine learning, different algorithms and some in depth questions into it. In the second interview I was interviewed on Spark, big data stack like Hadoop etc, some Java questions.

I applied for the position online. I was notified about a time sensitive online coding challenge two weeks later. The link to the challenge didn't arrive until the day before it was due. After the coding challenge, I was told I they would get back to me within a week. I didn't hear back from them for a month, which then I received contradictory messages congratulating me on making it to the final rounds of interview and informing me I had not been given an offer.