LTM Limited Graduate Trainee interview questions

I had my technical interview with LTIMindtree, but the interviewer asked mostly HR-related questions. I answered almost all of them. The only technical question she asked was about the name of my project and whether it was a solo or team effort. The interview lasted only 15 minutes. While I may have fumbled a bit with my spoken English, my seniors had told me that language proficiency doesn't matter much in a technical round. Because of this, I'm struggling to understand why I was rejected.