assigning a ton of variables confuses the game?

This may be your worst nightmare, but please do help with this. I'm making a menu thingy and it always says that "de1" is a nil value when its not.

 value = script.Parent.CurrentPage.Value
 l = script.Parent.L
 r = script.Parent.R
 mc1 = script.Parent:FindFirstChild("MC1")
 mc2 = script.Parent:FindFirstChild("MC2")
 mc3 = script.Parent:FindFirstChild("MC3")
 mc4 = script.Parent:FindFirstChild("MC4")
 mc5 = script.Parent:FindFirstChild("MC5")
 de1 = script.Parent:FindFirstChild("DE1")
 de2 = script.Parent:FindFirstChild("DE2")
 de3 = script.Parent:FindFirstChild("DE3")
 de4 = script.Parent:FindFirstChild("DE4")
 dr1 = script.Parent:FindFirstChild("DR1")
 dr2 = script.Parent:FindFirstChild("DR2")
 dr3 = script.Parent:FindFirstChild("DR3")
 dr4 = script.Parent:FindFirstChild("DR4")
 dr5 = script.Parent:FindFirstChild("DR5")
 debounce = false
 cooldown = 1
function ChangePage1()


    if value == 1 then
        debounce = true

        print 'value is 1'
        value = 2
        mc1.Visible = false
        mc2.Visible = false
        mc3.Visible = false
        mc4.Visible = false
        mc5.Visible = false
        de1.Visible = true
        de2.Visible = true
        de3.Visible = true
        de4.Visible = true

        l.Visible = true
        l.Active = true
        wait(cooldown)
        debounce = false





    else
    print 'value is 2'
    debounce = true
        value = 3
        de1.Visible = false
        de2.Visible = false
        de3.Visible = false
        de4.Visible = false

        dr1.Visible = true
        dr2.Visible = true
        dr3.Visible = true
        dr4.Visible = true
        dr5.Visible = true
        r.Visible = false
        r.Active = false
        wait(cooldown)
        debounce = false


    end



end

r.MouseButton1Click:Connect(ChangePage1)


function ChangePage2()

    if value == 2 then
        debounce = true
        print 'value is 2'
        value = 1
        de1.Visible = false
        de2.Visible = false
        de3.Visible = false
        de4.Visible = false

        mc1.Visible = true
        mc2.Visible = true
        mc3.Visible = false
        mc4.Visible = true
        mc5.Visible = true
        l.Visible = false
        l.Active = true
        wait(cooldown)
        debounce = false

    else
        debounce = true
        print 'value is 3'
        value = 2
        dr1.Visible = false
        dr2.Visible = false
        dr3.Visible = false
        dr4.Visible = false
        dr5.Visible = false
        de1.Visible = true
        de2.Visible = true
        de3.Visible = true
        de4.Visible = true

        r.Visible = true
        r.Active = true
        wait(cooldown)
        debounce = false

    end



end

l.MouseButton1Click:Connect(ChangePage2)

thanks!