The igniters on my range are clicking without me actuating them
When operating correctly, an electrical circuit supplies power to the ignitor system when a burner valve is turned on. This circuit usually consists of parallel connections to individual switches, with one switch mounted on each burner valve. If the oven is also heated by gas, there'll be a switch on the oven valve as well.
In your appliance, there's a flaw in the circuit and power is being provided when no burner (or oven) valve is actuated. This could be a short circuit between the wiring that carries the two sides of the circuit, or a valve switch may have failed closed, thus allowing the ignitor to be energized even though the user hasn't turned a valve on.