No wonder if panel is not aware of exact requirement for which you have been called. Probably false recruitment by HR. HR kept me engaged for more than 1 month and still did not clear the picture but asked to wait for another HR's review.

Shortlisted via Employee Referral, scheduled the first round in the very next week. The interviewer was just proving that he is right and not entertaining to answer properly, he was also rude, didn't like the way I answered. Advice to Management: Give a basic understanding of manners as instructions to the interviewers. No one is 100% perfect right.