I they no longer jump when the ignition is switched on all you need to do now is reset the arm to the new 9 o'clock position.
they never jumped at all what happened was
Get in turn the ignition on and the wipers do one intermittent wipe. stopping half way don the screen. the same type of wipe as if you click onto intermittent then back to off. and then everytime you repeat the process they stop in a different position.
only now after i did what you said ive only repeated the process of getting in car start iginiton once and this time they went downwards like you said.
ive not done anything else till i had a reply just incase and i wont till i know exactly what you mean. im sorry im not the sharpest tool in the box lol