Morgan Stanley Developer interview questions

Contacted by a recruiter. First round, interviewer asked in detail about my projects, my interests and why an I interested in joining Morgan Stanley. Interviewer told me they would be hiring me for machine learning position and explained in detail which machine learning problems their team is trying to solve. Round 2 was onsite at their NewYork Office. I was told i will be interviewed for machine learning role but the interview were total unorganized. Total 3 rounds. None of the rounds had any structure and not even a single ML related problem was asked or any algorithms and data structure questions. Most of the questions were from operating system, database and Java. Very bad experience, I still don't understand on what criteria they were accessing the candidate. I did answered the question but received a reject 2 weeks later.

First aptitude test was conducted containing 19 questions on data structures, DBMS, quants, logic etc. Then there were two technical interviews. The first technical round was elimination round. After technical rounds, there was one HR round.