If you turn the headlight switch to Auto it will turn the wipers to Auto aswell.
So, if you turn the wiper dial to 1, the wiper sensor, (which is positioned at the rear view mirror), will be at it's max sensitiviy, but the wipers will fluctuate through the wipes depending on the rain hitting the winscreen sensor.
If you want to turn the Auto wipers off, you need to turn the headlight switch to the '0' position, this will mean all wipers and headlights become Manual and the wipers will retime themselves to the sensitivity that you set on the stalk.
You'll soon get used to it.
