Why my If statement is not working? Is it being ignored?

Hey guys, sorry for asking again, but my If statement in the end is not working, what's the problem? When the var Buttonsleft == 0, it just doesn't print "All buttons done", why?

PS: Ignore the strange words like "porta", those are in portuguese... PS: I think the repeated functions can be transformed in just one, maybe that's a bad practice, but i just don't know how to do it, sorry :/

clickquantity1 = 5
clickquantity2 = 5
clickquantity3 = 5
clickquantity4 = 5
Buttonsleft = 4
porta1 = game.Workspace.Porta
porta2 = game.Workspace.Porta2
porta3 = game.Workspace.Porta3
porta4 = game.Workspace.Porta4
Table = {porta1, porta2, porta3, porta4}

function clickbutton1()
	workspace.Painel1.SurfaceGui.TextLabel.Text = clickquantity1 .. " Click's left"
	clickquantity1 = clickquantity1 - 1
	if clickquantity1 == 0 then
		workspace.Painel1.SurfaceGui.TextLabel.Text = "Finished Button"
		Buttonsleft = Buttonsleft - 1
	elseif clickquantity1 < 0 then
		workspace.Painel1.SurfaceGui.TextLabel.Text = "Buttons left: " .. Buttonsleft
	end
end

game.Workspace.Button1.ClickDetector.MouseClick:Connect(clickbutton1)

function clickbutton2()
	workspace.Painel2.SurfaceGui.TextLabel.Text = clickquantity2 .. " Click's left"
	clickquantity2 = clickquantity2 - 1
	if clickquantity2 == 0 then
		workspace.Painel2.SurfaceGui.TextLabel.Text = "Finished Button"
		Buttonsleft = Buttonsleft - 1
	elseif clickquantity2 < 0 then
		workspace.Painel2.SurfaceGui.TextLabel.Text = "Buttons left: " .. Buttonsleft
	end
end

game.Workspace.Button2.ClickDetector.MouseClick:Connect(clickbutton2)

function clickbutton3()
	workspace.Painel3.SurfaceGui.TextLabel.Text = clickquantity3 .. " Click's left"
	clickquantity3 = clickquantity3 - 1
	if clickquantity3 == 0 then
		workspace.Painel3.SurfaceGui.TextLabel.Text = "Finished Button"
		Buttonsleft = Buttonsleft - 1
	elseif clickquantity3 < 0 then
		workspace.Painel3.SurfaceGui.TextLabel.Text = "Buttons left: " .. Buttonsleft
	end
end

game.Workspace.Button3.ClickDetector.MouseClick:Connect(clickbutton3)

function clickbutton4()
	workspace.Painel4.SurfaceGui.TextLabel.Text = clickquantity4 .. " Click's left"
	clickquantity4 = clickquantity4 - 1
	if clickquantity4 == 0 then
		workspace.Painel4.SurfaceGui.TextLabel.Text = "Finished Button"
		Buttonsleft = Buttonsleft - 1
	elseif clickquantity4 < 0 then
		workspace.Painel4.SurfaceGui.TextLabel.Text = "Buttons left: " .. Buttonsleft
	end
end

game.Workspace.Button4.ClickDetector.MouseClick:Connect(clickbutton4)

if Buttonsleft == 0 then
	print("All buttons done")
end