Applied Materials interview questions

Gave 3 rounds of interview. First round being behavioral and the next two being behavioral and technical. Asked questions from my resume and generic questions (tell about a time when you had a challenging problem and how did you navigate). Got an offer in the portal but got rejected 2 weeks later.

There were two rounds. First was with a hiring manager. We talked about my technical background and what I worked in my former workplace. Second was with three directors. Contents were similar with the first. We talked about my technical background and what I worked. Atmosphere was really good but I couldn't get an offer