Need Help Setting up boost system!

Help and Feedback Scripting Support
#1

why is this adding another second after every second it counts down?

local DataCache = require(game.ServerScriptService.DataCache)

local function updateBoostDuration(player)
    local Data = DataCache.GetDataFrom(player)

    if Data.Boosts.MoreRuneLuck.StartTime and Data.Boosts.MoreRuneLuck.Duration > 0 then
        local currentTime = os.time()
        local elapsedTime = currentTime - Data.Boosts.MoreRuneLuck.StartTime

        if elapsedTime >= Data.Boosts.MoreRuneLuck.Duration then
            
            print(player.Name .. " has no more boosts.")
            Data.Boosts.MoreRuneLuck.Duration = 0
        else
            
            Data.Boosts.MoreRuneLuck.Duration = Data.Boosts.MoreRuneLuck.Duration - 1
        end

        player.Data.Boosts.MoreRuneLuck.Duration.Value = Data.Boosts.MoreRuneLuck.Duration
    end
end


game.Players.PlayerAdded:Connect(function(player)
    wait(8)

    local Data = DataCache.GetDataFrom(player)
    Data.Boosts.MoreRuneLuck.StartTime = os.time()

    while true do
        updateBoostDuration(player)
        task.wait(1)
    end
end)```