So I applied and got the position
Some employees dislike the idea of respecting authority in the workplace. Although you are now working in a different department, you've now become a figure of authority. Your coworkers may have developed feelings of subordination, especially if they've already become your friends. I believe in a basic rule at work. My friends are my friends and my coworkers are my coworkers. Some people may view my point as being stuck up. To hell with them. We're all at work to do our job.