First occurrence of Clone() shows up delayed or not at all?

I have a model located in my ServerStorage. A server script will clone this model when the user presses a key, and the model will move outward from the player using TweenService. For some reason, the first time a player in the game presses the key to clone and move the model, the model doesn't appear until halfway through the tween or sometimes not at all. After this first occurrence, the clone works as expected...

My guess is the model is being cached internally which is why I am only experiencing this on the first occurrence. Has anyone else run into something similar / know of a way to fix this?

The event:

local Workspace = game:GetService("Workspace")
local ServerStorage  = game:GetService("ServerStorage")
local arrow_model = ServerStorage:WaitForChild("Models"):WaitForChild("Arrow")

function getArrowTween(arrow, numBlocks, endPos)

	local arrowTime = (numBlocks * 0.09)

	local arrowInfo = TweenInfo.new(
	        arrowTime, 
		Enum.EasingStyle.Linear, 
		Enum.EasingDirection.In, 
		0, 
		false, 
		0
	)
	local arrowProps = { Position = endPos; }
	return TweenService:Create(arrow, arrowInfo, arrowProps)

end

ShootArrow.Event:Connect(function(startPos, endPos, lookDir, color)

	--create arrow
	local arrow = arrow_model:Clone()
	arrow.Parent = Workspace
	arrow.Position = startPos
	arrow.Orientation = Vector3.new(0, orient, -90)
	arrow.Color = color

	--create and play tween
	local arrowTween = getArrowTween(arrow, numBlocks, endPos)
	arrowTween:Play()
	arrowTween.Completed:Connect(function(playbackState)
		if playbackState == Enum.PlaybackState.Completed then
			arrow:Destroy()
		end
	end)

end)