Why does the ServerScriptService remove all its children when I test the game?

The ServerScriptService seems to remove the items inside it when I test a fireball script in Studio.

Heres the code:

--StarterPlayerScripts

local UIS = game:GetService("UserInputService")
local mouse = game.Players.LocalPlayer:GetMouse()
local debounce = false

UIS.InputBegan:Connect(function(key, processed)
    print("inputted")
    if processed or debounce then return end

    if key.KeyCode == Enum.KeyCode.Q then
        debounce = true
        print("q pressed")
        game:GetService("ServerScriptService").FireballScript.RemoteEvent:FireServer(mouse.Hit.Position)
    end

    wait(1)
    debounce = false
end)

--ServerScriptService (inside is a RemoteEvent called RemoteEvent)

script.RemoteEvent.OnServerEvent:Connect(function(Player, Mouse)

    print("remote event fired")
    local Fireball = game:GetService("ServerStorage").Fireball:Clone()
    local Explosion = game:GetService("ServerStorage").Explosion:Clone()
    local Character = Player.Character


    Fireball.Position = Character.HumanoidRootPart.Position
    Fireball.Parent = workspace
    local velocity = Instance.new("BodyVelocity", Fireball)
    velocity.Velocity = CFrame.new(Fireball.Position, Mouse).LookVector * 100


    Fireball.Touched:Connect(function(Touched)
        if Touched:IsDescendantOf(Character) then return end

        Explosion.Position = Fireball.Position
        Fireball:Destroy()
        Explosion.Parent = workspace

        if Touched.Parent:FindFirstChild("Humanoid") then
            Touched.Parent:FindFirstChild("Humanoid"):TakeDamage(30)
        end

        wait(2)
        for i = 1, 300 do
            Explosion.Fire.Size = Explosion.Fire.Size - 0.08
            Explosion.Fire.Heat = Explosion.Fire.Heat - 0.03
            wait()
        end
        Explosion:Destroy()
    end)
end)