Issue with A3 2009 cabriolet passenger window not dropping a little when door open's

Hi guys, girls as above driver door window drops a little but passanger doesnt,highlighted this to garage that sold me the car and as promised they will fix it for me,they sent it to an independent auto electrical firm for diagnosis they confirmed it was the window regulator,but my query is if it was the regulator wouldnt that mean the window wouldnt go up or down period?other than the drop down on door opening command the window is working fine,door locks with fob and interior light goes on when open and out when closed,iwas thinking maybe the door switch was at fault!!! Anyone had this or heard of this issue