Probably because you broke the code.
So, since we're going with the classroom route rather than the characters be stuck in the teacher's lounge like prior renditions, which classroom would you say they'd be stuck in? Just so it's established prior to the RP start.
Is there any possibility you'd be willing to facilitate a player playing as a member of the faculty? Nothing perverse, before people get that impression. I can send you a rough idea of my character if you're not sure.