6 months post-op & septum moves when I breathe, what's happening?

I had a septoplasty around 6 months ago, and my septum moves A LOT when I exhale — so much so that it completely blocks my right nasal cavity. Also, whenever I sleep on my side, my septum will “flop”/“sag” into the nasal cavity of the side I’m sleeping on and will completely obstruct the airway. For reference, I had a septoplasty in which my septum was scored and trimmed and adjusted to the midline. I’m worried that too much was removed or that my septum is very weak now. What’s happening?