EDDH Approaches - FS9 Garmin 500

Has anyone noticed that some of the default Garmin 500 approaches at EDDH are not being flown properly? I was on the LBE approach to runway 15 which had a smooth DME arc transitioning from a northern heading to the south facing ILS at runway 15. (I was on route from EDLW).The aircraft was about to fly the GPS transition when it decided to ignore the arc and headed directly for the runway's ILS. The avionics were set to GPS (not NAV) so I assumed that it would follow the transition as shown in the GPS by the little white flight path line :)Mark