I have a similar issue on Xbox with a Gamesir G7 Pro, but I only get drift on the left stick. I'm also able to keep my deadzone settings pretty low, around 2. This only happens on BF6.
I check my deadzones in the gamesir app before I launch BF6 and it's perfect, 0.00. It stays fine until my first death, and then I start to notice drift in the map/spawn screen. What's weird is that after every death, it seems to change, like it gets better or worse and sometimes the drift will go away for a round. But it always comes back.
My fix is to jump to the gamesir app while in the map/spawn screen and recalibrate my sticks really quick. This fixes it for a couple rounds (usually), but I have to do this countless times while I'm playing.
