is it a bad sign that the interviewers don't respond to any of the answers that I gave in my interview. Did anyone have this experience and got in? or in general had this experience?
No, in my opinion, it is not bad. They are there to evaluate you and some interviewers feel that the best way to evaluate you is to put in a position of "uncertainty." That is the best word I can come up with. They want to see if you can continue to respond coherently, decisively, etc.
Sounds like my DMU interview. That's on a whole other thread. Got waitlisted, and not hurt about it. Would have probably gone anywhere else other than DMU after the interview. And I ended up getting in somewhere else that seems to fit me better.
some interviewers act like they are playing poker and don't give you an impression of what they are feeling/thinking about your responses. Don't take it personal.