Awful ghosting on Xbox one X with C845

Hi ! Recently, the gameplay on my Xbox one x has started to exhibit a lot of ghosting and it's really distracting. It's doing it the most when playing Resident Evil 2 Remake. I have tried everything : - Using/Stop using Game mode - Turning off VRR on Game mode and on the console - changing HDMI port and video mode - turning off quick start - changing every single video setting, including every one linked to movement - reset the tv

Nothing works. I'm pissed because the tv did not do that when I got it, a few month ago. The few time it did, I just turned off Game mode and everything went back to normal.

I also have the impression that the ghosting effect sometimes creeps onto content I'm watching through streaming platforms...

I know the problem comes from game mode, but I feel like something makes it impossible to turn it off completely. It seems that the mode stays on while telling me it's off.

What can I do ?