Front right sparker does not spark when the knob is turned to the start position. The other three sparkers work as per normal.
When any of the other burners are started, the front right sparker DOES spark as it should (though of course there’s no gas to that burner).
Take the surface igniter out and move it to a different burner. See if the problem follows it to that burner or stays with the current burner. If it follows it, replace the igniter. If it does not, replace the spark module. This advice assumes that when the problem burner control knob is turned on, the other three burners do indeed spark as normal.