It's a ReShade preset. Not sure if the incompatibility lies in something you guys, Steam, or both would have to address but I wanted to point it out.
For what it's worth, I'm playing with an old controller and ReShade until this gets sorted out because it makes the already great-looking game absolutely fantastic
ETA: The ReShade plugin also seems to interfere with other Steam functionality. I can't use either the F12 or SteamButton+RT .shortcuts to take screenshots. If I launch the game via Big Picture mode, a lot of the time (maybe all of the time? Haven't tested extensively) the ReShade settings don't take.
Last Edit: 7 months 3 weeks ago by FatCat0. Reason: Added details
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Dark Souls 3 Steam Controller Conflict 7 months 3 weeks ago #2