Why is this script letting me place the block, even though the "cells" are closed"?

Why is this script letting me place the block, even if the one of the "cells" are "closed"?

By "closed", I mean that all the cells has an isOpen - value set to true, and when a block is placed on top of them, they are automatically set to false, so that I cannot place on those cells again, but it still lets me place the block(and yes, I have checked that the variablesand that the isOpen - value is updated correctly)

Look further down on this question for images to see what actually happens.

My code is as follows:

----Placing the block----
Mouse.Button1Down:connect(function()
    if Cooldown == false then
        if ItemsLeft.Value > 0 then
            ItemsLeft.Value = ItemsLeft.Value - 1
            Cooldown = true 
            for i,x in ipairs(modelCells:GetChildren()) do
                for i,v in pairs(TycoonCells:GetChildren()) do
                    if x.Name == v.cellPosHolder.cellPos.Value then
                        if v.isOpen.Value == true then --//This should, in my eyes, check if all of the cells are open, and if they are, you may place the block, but even if one of the cells are closed (i.e their / its isOpen.Value == false), the block still gets placed, why?
                            v.isOpen.Value = false
                            local new = cloneModel:clone()
                            new.Parent = ItemsPlacedFolder
                            BlockBox.Color3 = Color3.new(255,0,0)
                            for i,v in pairs(new:GetChildren()) do
                                if v:IsA("BasePart") then
                                    if v.Name ~= "Cell" then
                                        v.CanCollide = true
                                        v.Transparency = 0
                                    end
                                end
                            end
                        else
                            print("One of the cells is not open, please choose some other spot to place your item!") --//This should print when one or more of the "cells" have a value named "isOpen", and the value is true
                        end
                    end
                end
            end             
        end
    end
    ----////Check if we have any of the item left.
        if ItemsLeft.Value <= 0 then --//If we don't then...
            BlockBox.Adornee = nil
            BlockBox.Visible = false
            cloneModel:Destroy()
            Inventory.Visible = false
            OpenCloseButton.Visible = true
            for i,v in pairs(PlrGui:GetChildren()) do
                if v.Name == "CellBox" then
                    local boxes = v
                    v.Visible = false
                end
            end
        end
    wait(0.05)
    Cooldown = false
    BlockBox.Color3 = Color3.new(0,255,0)
end)

Link to images:

http://pho.to/AZcJB

Image 1 shows the cells.

Image 2 shows what it looks like when I have placed blocks inside of each other, which should not happen because the cells' isOpen value is set to false.

Image 3 shows when just 1 block is placed.

Image 4 shows my output.