Random problems with script during F.E. test?

I made a script that works fine in play mode but not in test due to F.E., but I don't understand why. Can anybody tell me why/help me fix it?

local modes = {"Infection", "Juggernaught", "Dominance"}

local function round()
	if script.Mode.Value == "Preperation" then
	for i,v in pairs(game.Workspace.Votes:GetChildren()) do
		game.Workspace[v.Name].Parent = game.ServerStorage
	end
	local maps = game.Lighting.Maps:GetChildren()
	local Map1 = math.random(1,#maps)
	local Map2 = math.random(1,#maps)
	local Map3 = math.random(1,#maps)
	local Mode1 = modes[math.random(1,#modes)]
	local Mode2 = modes[math.random(1,#modes)]
	local Mode3 = modes[math.random(1,#modes)]
	repeat
		Map2 = math.random(1,#maps)
	until Map2 ~= Map1
	repeat
		Map3 = math.random(1,#maps)
	until Map3 ~= Map1 and Map3 ~= Map2
	game.ReplicatedStorage.Ready:FireAllClients(Mode1, Mode2, Mode3, Map1, Map2, Map3)
	end
	end
script.Mode.Changed:connect(function()
	round()
end)
wait(1)
script.Mode.Value = "Preperation"