Are you all allowed to sit at your desk while students do independent work?

I got in trouble for being caught sitting at my desk during class. The kids were working in groups and I have a TON of behavior tracking sheets that have to be filled out before the end of the day. It was about 30 minutes before school ended so I was trying to get them done. I also have an autoimmune disease so some days it’s hard to be up for 8 hours straight. They want us always circulating the room, even when they are doing independent work. Is that normal?