Recruiter phone call then hiring manager screen interview then panel interview finally director interview. In hm interview, he mainly asked about details of projects.Like how do you validate your model how do you distinguish your model from others

The interview was very intense, lasting several hours with 8 people. I was asked several technical questions. Honestly, none of the questions were difficult, and I was able to answer all of them well. However, many of the other candidates had several years of industry experience, while I only had research experience from university. This was the only interview where I didn't miss any questions, yet I didn’t receive the offer, which was very surprising.