Tech Mahindra Developer interview questions

I applied online in Tech Mahindra. The complete hiring process takes around 3 months and very tedious. They conduct 5 rounds, I passed 4 rounds all were very easy. The 5th round was HR round and I got rejected in that round, I don't know why?

First round is aptitude round, which is easy Second round is coding round which is also easy Then 2 rounds of technical interview and final round of HR interview Technical interviews are easy to moderate and HR interview is easy only