I have a devproduct that is to give players +30 on their leaderstats, but for some odd reason it is giving them 100 or 120 or 150, the number is completely random, wth is going on?

I have this in a GUI button in a LocalScript so people can purchase the devproduct

wait(0.1)
local player = game.Players.LocalPlayer
local currency = player:WaitForChild('leaderstats').Coins
local itembutton = script.Parent--- MAIN BUTTON
local desc = script.Parent.Parent.Parent.Desc
local indextext = script.Parent.Text  -- REMEMBERS TEXT IN MAIN BUTTON
local devid = idhere  



itembutton.MouseEnter:connect(function()
	desc.Text = '30 Coins'
end)

itembutton.MouseLeave:connect(function()
itembutton.Parent.Parent.ItemImage.Image = ''
desc.Text = ''
end)

itembutton.MouseButton1Click:connect(function()
	game:GetService('MarketplaceService'):PromptProductPurchase(game.Players.LocalPlayer, devid)
end)

I then have this in a serverscript to check for people that have the devproduct

MarketplaceService = game:GetService("MarketplaceService")
local DataStore = game:GetService("DataStoreService"):GetDataStore("coincurrency")
local devid = IDplaceholderhere


MarketplaceService.ProcessReceipt = function(receiptInfo)
    for i, v in pairs(game.Players:GetChildren()) do 
        if v.userId == receiptInfo.PlayerId then
            if receiptInfo.ProductId == devid then
			v.leaderstats.Coins.Value = v.leaderstats.Coins.Value + 30	
			else
			wait()
			print("Gave 30 coins to player")
               --end)
            end
        end
    end
end

What exactly am I doing wrong here?

Anonymous