Can I be demoted for relief if the position is a grade higher than I hold?

Long story short, I was promoted into a unit to be a squad leader and 3 months later the section sergeant was promoted out. They put me in the position because out of 18 on the MTOE we had 4 including me and the CPT. So with no guidance I've been trying to figure out what the leadership wants and have been told that I'm jacked almost every day. The talking behind the back is done at full volume within earshot of relieving me and the CSM has let me know that if I keep on missing the mark he is going to start paperwork. My question is can they both kick me out of the section sergeant position and demote me at the same time? I haven't been able to see anything in the regulations either way.