Why is my ship not going straight when mouse is at center of screen?

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#1

The ship should be going straight when the fake mouse is at the center of the screen however it going slightly downward if you move the mouse up less than a certain amount.

RunService.Stepped:Connect(function()
	local mouseDelta = UserInputService:GetMouseDelta()
	UserInputService.MouseBehavior = Enum.MouseBehavior.LockCenter

	if mouseDelta.Magnitude > 0 then
		fakeMouse.Position = UDim2.new(0.5,fakeMouse.Position.X.Offset + mouseDelta.X,0.5,fakeMouse.Position.Y.Offset + mouseDelta.Y)
	else
		local distance = fakeMouse.AbsolutePosition.Magnitude
		fakeMouse.Position = UDim2.new(0.5,fakeMouse.Position.X.Offset - (fakeMouse.Position.X.Offset * mouseForce/distance),0.5,fakeMouse.Position.Y.Offset - (fakeMouse.Position.Y.Offset * mouseForce/distance))
	end
	
	local absolutePosition = fakeMouse.AbsolutePosition
	local absoluteSize = fakeMouse.AbsoluteSize

	
	local length = 500
	local unitRay = Camera:ScreenPointToRay(absolutePosition.X, absolutePosition.Y)
	local rayDirection = Ray.new(unitRay.Origin, unitRay.Direction * length).Direction
	rayDirection *= 100
	
	if mouseDelta.Magnitude > 0 then
		ship.Part.AlignOrientation.CFrame = CFrame.lookAt(ship.Part.Position,rayDirection)
		lastLook = ship.Part.AlignOrientation.CFrame
	else
		ship.Part.AlignOrientation.CFrame = ship.Part.CFrame
	end
	
	local targetPos = Camera:WorldToScreenPoint(ship.AimPart.CFrame.Position)
	target.Position = UDim2.new(0,targetPos.X,0,targetPos.Y)
	
	part.Position = rayDirection/100
end)
#2

Bumping, still having the same issue.