The interview wasn't well designed.
We were supposed to have 1 hour interview but I guess some main questions were left til the very end and we did not have enough time to cover those questions.
I rushed through their questions because I was busy that day. The interviewer did ask me if I wanted to stay and discuss more but I really couldn't.
So we were both left unsatisfied. I couldn't answer as well as I could, and I may appear as uninterested as I simply did not have the extra time for them.