[SilentSoul]

Because its samp default color you can change this default color by using this

pawn Код:

public OnPlayerSpawn(playerid)
{ 
    SetPlayerColor(playerid, 0xFFFFFFAA); //this will set default  color to white
    return 1;
}

You can change color from here
http://www.colorpicker.com/
Add also add AA at the last of color hex code example i found white color on colorpicker as FFFFFF
Must be changed to :
0xFFFFFFAA

0x"Colorhere"AA