I searched the forum but no other problems were similar to mine (and no solutions worked).
I am using manjaro KDE with everything up-to-date.
I am starting redshift by terminal with -O 4000. I sets the redness correctly, but after one second, everything reverts to the old colour. I can’t tell where the problem is, as no error message is displayed. I tried running the program multiple times, with -X, nothing worked ok.