Why isn't my DataStore saving and how would I fix this?

So basically, I made a short project in which a player's JumpPower is increased per click, here are the two scripts:

local datastore = game:GetService("DataStoreService")
local powerStore = datastore:GetDataStore("powerStore")

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

    local power = Instance.new("IntValue", leaderstats)
    power.Name = "Power"

    local savedata
    local s, f = pcall(function()
        savedata = powerStore:GetAsync(player.UserId)
    end)

    if s then
        power.Value = savedata
        print("data successfully loaded")
    else 
        print("data not loaded")
    end

    player.CharacterAdded:Connect(function(character)
        character.Humanoid.JumpHeight = power.Value
    end)
end)

game.Players.PlayerRemoving:Connect(function(player)
    local s, f = pcall(function()
        powerStore:SetAsync(player.UserId, player.leaderstats.Power.Value)
    end)

    if s then
        print("data successfully saved")
    else 
        print("data not saved")
    end
end)

^ thats the datastore

and this is the GUI:

local button = script.Parent

button.MouseButton1Click:Connect(function()
    game.Players.LocalPlayer.leaderstats.Power.Value += 1
    game.Players.LocalPlayer.Character.Humanoid.JumpHeight = game.Players.LocalPlayer.leaderstats.Power.Value
end)

When I go in the game, and use F9 to change the value of the power, the datastores works just fine and saves the value, however when I use the button to increase it, then it doesn't save/load anything.