DLSS setting won't save

since the latest update, my DLSS setting won’t save anymore. I need to config my DLSS setting every time I run the game.
Under the DLSS setting, I only turn on DLAA. No DLSS, No Frame Generation.
But every time I start the game, DLSS setting goes back to DLSS: Balance. Frame Generation: ON. DLAA: Off

So, this bug, any idea how to fix it?