Wells Fargo Java Full Stack Developer interview questions

The interview was very much simple. Lot of people came to attend the drive and needn't to wait much for my turn. Within a hour itself, i was being called for the written test. The questions were from all the areas like java, spring, hibernate, html, css and jquery, Out of 30, i scored 15. I was being called for the next round f2f. It went for an hour and mostly the question were average. I answered almost all the questions. After that the interviewer told me to wait. And he discussed with other team and told me to leave for the day. I didn't know what didn't went well. I am really surprised after answering all, what was the problem?