Why is the color displayed incorrectly?

Question

css

In my project, I use the following
scss colors

$black_blue_color: #05020f;
$blue_color: #1b8ee3;
$light_blue_color: #34a9ff;
$lighter_blue_color: #1b9eff;
$the_lightest_blue_color: #2aa4ff;
$teal_green_color: #00bd9a;
$pink_color: #ff6960;
$light_gray_color: #5d5c71;
$gray_color: #353343;
$dark_gray_color: #1e1c2a;
$gray_blue_color: #221f30; //Отображается некорректно как сиреневый
$darkest_gray_color: #14111d;
$gold_color: #f1940e;

All colors display correctly on my computer (monitor), many of my computers.
But for a small number of users, the color #221f30 is displayed as bright lilac.
And other colors are also ok.
Why is the color displayed incorrectly?

Answer 1

https://www.google.com.ua/search?q=%23221f30
it is from the blue palette
Calibrate the monitor

Answer 2

Maybe the style for the visited link worked there? Any selector on the old browser does not work? Or the user has a user style set ... It's just guessing.