Why is the value adding more than it should even with debounce?

I'm making a test project where if you step on a block it will either give you money or take away money, whichever one happens is completely randomized. It will either give you 200-600 money or take it away. Here is the code:

local ChangeMoney = {200, 300, 400, 500, 600}
local isTouched = false -- debounce

game.Players.PlayerAdded:Connect(function (player)
    local leaderstats = Instance.new("Folder")
    leaderstats.Parent = player
    leaderstats.Name = "leaderstats"

    Money = Instance.new("IntValue")
    Money.Parent = leaderstats
    Money.Name = "Money"
    Money.Value = 1000

end)

workspace.ChanceMoney.Touched:Connect(function (hit)
    local ChanceValue = math.random(1, 2) -- Gives money if 1, takes if 2
    if game.Players:GetPlayerFromCharacter(hit.Parent) then
        if not isTouched then
            isTouched = true
            for i, v in pairs(ChangeMoney) do
                local RandIndex = math.random(1, 5) --For ChangeMoney's index
                if ChanceValue == 1 then
                    if Money.Value > 0 and i == RandIndex then
                        Money.Value -= v
                        elseif Money.Value <= 0 then -- Preventing money to be negative
                        Money.Value = 0
                    end
                elseif i == RandIndex and ChanceValue == 2 then
                    Money.Value += v
                end
            end
            wait(5)
            isTouched = false
        end
    end
end)

The thing is it works, but not as expected. Even if it's not under the table, it somehow adds random numbers to the value (even with debounce on). I could have 1,000 dollars and when I step on it I could get 1,900, 2,100, 1,700, etc. Those numbers are not listed under the table, and I'm not sure how it adds more than it should. It's the same with subtracting. I could have 1,000 and somehow end up with 100 dollars. I don't think it's all the numbers combined, as the integers in ChangeMoney all added up is 2000, and the result is usually not the sum of that. Wondering how to get this fixed.