Screen being red on a black background on OLED and LCD displays

Both my screens (an OLED and a LCD) shine red when displaying black.
It was especially visible in the dark.
This problem only occurs on Mutter based desktops, Plasma->Kwin does not have that issue.

Is that true black, or isn’t it something like night mode shifting the hue?

As far as I know OLED shows true black I don’t have night mode on

Does disabling the color profiles for the displays in gnome-control-center color help?

Maybe its an filter that you put ? Or you had adjusted something in panel settings ?