RAW DATA ILS A320, RUNWAY TRACK DRIFTS AWAY below 1000ft

[SENDIL NATARAJAN]

I have seen that after the recent update, while doing raw data  ILS approaches on A320, the Runway track Index begins to drift away for no reason,

Example, If the Rw Track was 283, then as we fly below 1000Ft, the runway track begins to drift away as far as 273 0r 293 ..some times to the left and some times to the right, i dont know if this is due to update or some other issue, its happening on all airports .Any inputs from experts is appreciated.