I was flying between Heathrow and Manchester planning to land on 05R, I connected to the correct ILS and made sure it was 05R. I was flying the a320 so I decided to take advantage of the APPR feature, I switched it on as soon as I was established on the localiser. As I was approaching, I knowticed that the APPR was lining me up for 05L however I was on the right glidslope for 05R. I checked the small bar at the bottom of the screen that tells you weather you are lined up for the centreline and it showed that I was way off course?!!!? Can anyone tell me why this happened because I don’t know weather it is an error or a mistake on my behalf.
Thanks in advance,