PubMatic Software Development Engineer In Test SDET interview questions

ROUND 1: They asked about coding, automation, and SQL queries. ROUND 2: Again, they asked about coding, SQL, and Linux commands. ROUND 3: The same topics were covered as in the previous rounds. It was a techno-managerial round. My code ran successfully, and I answered all the questions correctly. ROUND 4: They called me for an in-person meeting at their office, referring to it as a "general discussion." After this, HR informed me that the panel had given negative feedback, but the reasons were unclear. It felt like they wasted my time with multiple technical rounds, only to dismiss me without a proper explanation.