Why is the silver amount in my leaderboard reverting to its unspent state?

The game I'm working on uses some of the elements from the Simulator genre that's so popular right now. You gather 'salvage' in the game world and exchange it for 'silver' at the sell spot. The silver is stored in the leaderboard and is the game's primary currency. Here is my code for the sell spot:

local isTouched = false
script.Parent.Touched:Connect(function(hit)
    local findhum = hit.Parent:FindFirstChild("Humanoid")
    if findhum then 
        if not isTouched then
            isTouched = true
            local character = hit.Parent
            local player = game.Players:GetPlayerFromCharacter(character)
            local silver = player.leaderstats.Silver
            local packContainer = character:WaitForChild("Container") --Get player's bag
            local packSpace = packContainer.Max.Value --Max amount the bag can hold
            local packCur = packContainer.Value.Value --Current amount in the bag
            silver.Value = silver.Value + packCur * 2 --Add silver to leaderboard
            packContainer.Value.Value = 0   --Set bag to empty
            wait(5)
            isTouched = false
        end
    end

end)

You use the silver earned at one of the stores to buy new tools. Here's the code for the store that deals with the purchasing of a new tool.

local cam = workspace.CurrentCamera
local character = script.Parent
local player = game.Players:GetPlayerFromCharacter(character)
local macheteSpawnEvent = game.ReplicatedStorage:WaitForChild("MacheteSpawnEvent")
local hammerSpawnEvent = game.ReplicatedStorage:WaitForChild("HammerSpawnEvent")
--Set camera to look at store
repeat wait()
    cam.CameraType = Enum.CameraType.Scriptable
until cam.CameraType == Enum.CameraType.Scriptable
cam.CFrame = workspace.StartingStation.cameraPart1.CFrame
--Show Store Interface
player.PlayerGui.StoreGui.Frame.Visible = false
local screenStuff = player.PlayerGui.MacheteGui.Frame
screenStuff.Visible = true
local hammerScreenStuff = player.PlayerGui.HammerGui.Frame
--Disable normal gui
local StarterGui = game:GetService('StarterGui') 
StarterGui:SetCoreGuiEnabled(Enum.CoreGuiType.All, false)

local mPresent = player.Backpack:FindFirstChild("Machete") --Check to see if player already has Machete
if mPresent == nil then 
    screenStuff.Buy.Active = true
else
    screenStuff.Buy.Active = false
    screenStuff.Buy.Text = "Purchased"
end

function buttonActive()
    local silver = player.leaderstats.Silver --Get silver from leaderboard
    local cost = game.Workspace.StartingStation.Machete.Value.Value -- Get cost of Machete
    if cost < silver.Value then
        player.leaderstats.Silver.Value = player.leaderstats.Silver.Value - cost --Subtract cost of machete from leaderboard
        print("Silver after purchase.."..player.leaderstats.Silver.Value)
        macheteSpawnEvent:FireServer(player) --Give player machete
        screenStuff.Buy.Active = false
        screenStuff.Buy.Text = "Purchased"

    end
end
function closeActive()
    screenStuff.Visible = false
    --Return camera to player
    game.Workspace.CurrentCamera.CameraSubject = game.Players.LocalPlayer.Character.Humanoid
    game.Workspace.CurrentCamera.CameraType = "Custom"
    --Enable normal gui
    local StarterGui = game:GetService('StarterGui') 
    StarterGui:SetCoreGuiEnabled(Enum.CoreGuiType.All, true)
    script:Destroy()
end

function rightActive()
    screenStuff.Visible = false
    hammerScreenStuff.Visible = true
    cam.CFrame = workspace.StartingStation.cameraPart2.CFrame
end

function hammerLeftActive()
    hammerScreenStuff.Visible = false
    screenStuff.Visible = true
    cam.CFrame = workspace.StartingStation.cameraPart1.CFrame
end

function hammerButtonActive()
    local silver = game.Players.LocalPlayer.leaderstats.Silver
    local cost = game.Workspace.StartingStation.Hammer.Value.Value
    if cost <= silver.Value then
        game.Players.LocalPlayer.leaderstats.Silver.Value = silver.Value - cost
        hammerSpawnEvent:FireServer(player)
        hammerScreenStuff.Buy.Active = false
        hammerScreenStuff.Buy.Text = "Purchased"

    end
end

function hammerCloseActive()
    hammerScreenStuff.Visible = false
    --Return camera to player
    game.Workspace.CurrentCamera.CameraSubject = game.Players.LocalPlayer.Character.Humanoid
    game.Workspace.CurrentCamera.CameraType = "Custom"
    --Enable normal gui
    local StarterGui = game:GetService('StarterGui') 
    StarterGui:SetCoreGuiEnabled(Enum.CoreGuiType.All, true)
    script:Destroy()
end

function hammerRightActive()

end

screenStuff.Buy.Activated:connect(buttonActive)
screenStuff.CloseButton.Activated:connect(closeActive)
screenStuff.RightButton.Activated:Connect(rightActive)
hammerScreenStuff.LeftButton.Activated:Connect(hammerLeftActive)
hammerScreenStuff.Buy.Activated:connect(hammerButtonActive)
hammerScreenStuff.CloseButton.Activated:Connect(hammerCloseActive)
hammerScreenStuff.RightButton.Activated:Connect(hammerRightActive)

Once you buy the machete the leaderboard does update and show the proper amount of silver left. I can click into the player's leaderstats folder and clearly see that the Silver.Value has been changed accordingly. However... if I go collect another salvage and trade it for silver, the leaderboard jumps back to the original pre-purchase amount plus the new salvage. For example, I have 214 Silver. The machete costs 200 Silver. Leaderboard now shows 14 Silver. I collect 1 Salvage, which sells for 2 Silver. My new total should be 16, but instead the leaderboard now shows 216.

What have I done wrong?