Developer product issue, anyone know how to fix this? [Added Script]

Basically, I have to people you can talk to that will give you tools. The dialog choice's scripting in both of them do not use the same variables, but MarketplaceService is allowing you to select a choice on one, leave the buy option there, and go to the other person with the other choices and pick one of those, and that one will go through and purchase it when you really bought for the other choice.

I don't know how to fix this at all, I don't know if it's my scripting, or MarketplaceService just acting weird, has anyone else had this issue?

Here's the script, I didn't write this, so I don't know what's wrong with it.

local Service = game:GetService("MarketplaceService");

local SellItems = {
	["Tool1"]  = 31134452;
	["Tool2"] = 31134454;
}

for Name,Item in pairs(SellItems) do
	local Choice = script.Choice1:Clone();
	Choice.Name = Name
	Choice.UserDialog = Name
	Choice.ResponseDialog = "Let's not talk to anyone about this, eh?";
	Choice.Parent = script.Parent;
end

function GetChoice(Name)
	for y,ID in pairs(SellItems) do
		if y == Name then
			return y,ID
		end
	end
	return
end

script.Parent.DialogChoiceSelected:connect(function(Player, Choice) 
	local s,e = coroutine.resume(coroutine.create(function()
		if SellItems[Choice.Name] and Player then
			local Choice,ID = GetChoice(Choice.Name)
			if Player.Character and Choice and ID then
				if not Player.Character:findFirstChild(Choice) then
					if Player:findFirstChild("Backpack") then
						if not Player.Backpack:findFirstChild(Choice) then
							print("Does not own");
							Service.ProcessReceipt = (function(receiptInfo)
								local Tool = game.Lighting.DealerTools.Tools:WaitForChild(Choice):Clone()
								Tool.Parent = Player.Backpack; 
								return Enum.ProductPurchaseDecision.PurchaseGranted;
							end)
							Service:PromptProductPurchase(Player,ID);
						end
					end
				end
			end
		end
	end))
	if not s then
		warn(e)
	end
end)