Because based on the central Government the university officials are inclined to a particular ideology. Now the central government is currently politically Right wing so anything that's causing them trouble or might caught them trouble will be banned. The vice versa happens when the central government is following any other ideology. In short the university is full of shit show on a daily basis and students are just a tool to satisfy someone else's agenda. (I'm currently in the same university and know people who organized the event).