DA62 ILS approach messed up

I finally did it to 16L ILS… I think the problem is when I flew past BOOGI, the GPS canceled the transition TONUX as well as the approach waypoints. So I thought the system went wrong so I switched to heading to manually intercept the localizer, but for whatever reason it didn’t capture. This time I stayed on the GPS course. even it redirected straight to the airport the aircraft still followed the previously set approach so it went all right. Please see the screenshot…