The indications on flightdeck are absolutely normal
Indeed. Some years ago, on a contract sim training exercise with SAA, their 732 box did a very nice false indication for one of the aerodromes. Needless to say, I set folk up to see it happen.
Hence my suggestion that one should use something else to position in the right place before getting excited by the ILS. Once folk see how it can sucker them in, the message sinks in nicely.
Trainee reached up and hit the APP button
Another trap. The better sequence is
(a) get on or approaching the localiser by other means, then select LOC - avoids a false course problem
(b) approaching the correct distance for the glideslope, then select GS - avoids a false slope problem .. although the VSI tells the story before things get interesting. Obviously, with a functioning DME, this shouldn't catch anyone out.
We never trusted our lives totally to a bunch of electrons .. Anything to avoid excitement in the aeroplane ..