ClearTax Software Engineer II interview questions

I applied through referral. The process took 2 to 3 weeks. Total - 3 rounds. 1st round - LLD Machine coding round - Design BookMyShow (Take ur fav ide, fav oop lang, a runnable code gives you extra reward but it is fine if you can explain OOP, Design Patterns. A few HLD follow up questions were also asked). 2nd Round - LLD Design Cricbuzz (for one specific game - Badminton, Coding is not expected, used draw.io). (Explaining all the entities and relations, Design patterns You should be able to drive the discussion) 3rd Round - HM Round, 75 min - I found this very wierd. The Hiring Manager is not interested about my work at all. He was only interested in asking a lot of questions and noting my solutions. HR confirmed that this is my last round. So, this whole round seemed like it was intended not to hire me. (Asked a puzzle, SQL queries, 1 DSA question, 1 HLD question, again 1 DSA question: on Inverted Index. I didnt answer this: seemed like a std question, but couldn't answer this with intution or logic)