BrickColor gives random colors for the same number?

I set a part to be a specific color with it's RGB values all the same, for example 255,255,255 or 122,122,122.

However it appears that when I run this script, it changes the RGB values to something like 123,143,151

local angleStrength = 7

math.randomseed(tick())

for i, v in pairs(workspace:GetChildren()) do
    if v.Name == "RockWall" then
        local colorValue = math.random(120,180)

        v.CFrame = v.CFrame * CFrame.fromOrientation(math.rad(math.random(-angleStrength,angleStrength)),math.rad(math.random(-angleStrength,angleStrength)),math.rad(math.random(-angleStrength,angleStrength)))

        v.BrickColor = BrickColor.new(Color3.fromRGB(colorValue,colorValue,colorValue))
    end
end