Having problems with saving a table using Datastore 2?

I'm trying to use DataStore2 to save a folder. I've previously had trouble with saving folders with the normal Datastore, so there may be something wrong with what I'm doing. This is my code:

local DataStore2 = require (1936396537)

local e = {}

game.Players.PlayerAdded:Connect(function(player)
	
	local PetsDataStore = DataStore2("PetsDataStoree", player)
	
	local Folder = Instance.new("Folder")
	Folder.Parent = player
	Folder.Name = "Pets"
	
	local function petUpdate(value)
		e = PetsDataStore:Get(value)
		for _, pet in ipairs(e) do
			local PetValue = Instance.new("BoolValue")
			PetValue.Parent = Folder
			PetValue.Name = pet
		end
	end
	
	petUpdate(e)
	PetsDataStore:OnUpdate(petUpdate)
	
end)


	game.ReplicatedStorage.DataUpdate.OnServerEvent:Connect(function(player, value, DataType)
		local DataStore = DataStore2(DataType, player)
		
		if DataType == "PetsDataStoree" then
			local Pets = player.Pets
			local Pet = Instance.new("BoolValue")
			--Pet.Name = value
			Pet.Parent = Pets
		local ee = {}
		for _, v in ipairs(Pets:GetChildren()) do
			table.insert(ee, v.Name)
		end
		DataStore:Set(ee)
		end
	end)
	

Also a 2nd script inside of a local script, inside of a gui button

	local PetsTable = {"Dog"}

script.Parent.MouseButton1Click:Connect(function()
	game.ReplicatedStorage.DataUpdate:FireServer(PetsTable, "PetsDataStoree")
end)

The purpose of this is: when the gui is clicked, it adds the pet into the pet data store, which is then supposed to save. The problem is, everytime I click the gui, it multiplies whatever is inside the pets folder by 2. When it saves, it then saves half of what was previously showed in the folder. I'm not sure why this is happening, it's just supposed to add 1 value into the table everytime I click the gui. Is there anything wrong with this script, or am I not using it right? Any help is appreciated, thanks!