Dropbox Sales/User Ops interview questions

The interview was pleasant, I thought it went well. We were getting along but then I wasn't chosen to move on. Not exactly sure what went wrong. During the first interview, I was asked to explain a recent project, no guidelines besides that. A friend also interviewed and was given a different task to plan a made up project. I felt that this was unfair as it allowed for more thoughtfulness to be displayed through this type of question. He moved on to the next round.