Stamina Bar is Tweening Past Maximum Stamina?

I've made an FE compatible sprinting GUI that depletes when the user holds LeftShift. When the sprinting RE is fired to the server, the player's speed is changed to 24 when sprinting, and back to 16 otherwise.

Now, there are two problems that I'm having here with this script:

1) For some reason the bar depletes faster in-game rather than in test mode. I've come up with a work around by increasing the time it takes to deplete, but I'm still not sure why this happens.

2) The stamina bar always moves up to 101 stamina rather than the preferred 100 even when I've made checks to see if the bar should replete only when currentStamina < maxStamina. Note that this occurs both in-game and in test mode.

CLIENT:

local players = game:GetService('Players')
local replicatedStorage = game:GetService('ReplicatedStorage')
local userInputService = game:GetService('UserInputService')

local player = players.LocalPlayer
local character = player.Character or player.CharacterAdded:wait()
local humanoid = character:WaitForChild('Humanoid')

local playerGui = player:WaitForChild('PlayerGui')
local gui = playerGui:WaitForChild('GUI')

local events = replicatedStorage:WaitForChild('Events')

local staminaGui = gui:WaitForChild('Stamina')
local staminaBar = staminaGui:WaitForChild('Frame'):WaitForChild('Frame')
local staminaEvent = events:WaitForChild('Stamina_Event')

local currStamina = 100

function updateStamina()
    staminaBar:TweenSize(UDim2.new(currStamina / 100, 0, 0.5, 0), 'Out', 'Quad', 0.1)
end

userInputService.InputBegan:Connect(function(input, event)
    if event or currStamina <= 0 then
        return
    end
    if input.KeyCode.Name == 'LeftShift' then
        staminaEvent:FireServer('sprint', 24)
        repeat
            if humanoid.MoveDirection.Magnitude > 0.1 then
                currStamina = currStamina - 1
                updateStamina()
            end
            wait()
        until not userInputService:IsKeyDown(Enum.KeyCode.LeftShift) or currStamina <= 0
        staminaEvent:FireServer('sprint', 16)
        if currStamina <= 0 then
            wait(2)
        else
            wait(1)
        end
        while not userInputService:IsKeyDown(Enum.KeyCode.LeftShift) and currStamina < 100 do
            currStamina = currStamina + 1
            updateStamina()
            wait(0.4)
        end
    end
end)

SERVER:

events:WaitForChild('Stamina_Event').OnServerEvent:Connect(function(player, request, data)
    if request == 'sprint' then
        player.Character.Humanoid.WalkSpeed = data
    end
end)