So as the title says,

If activating FidelityFX the screen is filled with a. . .don't know how exaclty to discribe it, kinda a weird shaddowing. Especially in darker areas.
I saw that already in other old games where they are rendering weather effekts (daytime getting dark and bright again) for brightness difference, but Fidelity is increasing this effect by a high visible amount.
At best I can explain by some pictures. (linking to a pic uploader)
FideltiyFX on:
https://www.bildhost.com/images/2021/09/09/2021-09-09_642688469.png
https://www.bildhost.com/images/2021/09/09/2021-09-09_642697470.png

Simply Fidelity off.
https://www.bildhost.com/images/2021/09/09/2021-09-09_642731004.png

Another example FSR on:
https://www.bildhost.com/images/2021/09/09/2021-09-09_642813254.png

FSR off:
https://www.bildhost.com/images/2021/09/09/2021-09-09_642931746.png

On screenshots it's even looking less worse than ingame.
Would be nice to do something about it.
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BTW: your forum for uploading immages are the worst possible ever...
No additional options if uploading pics from PC no previews and no links if uploading on hosters either. Only a direct picture insertion which is terrible bad, too