Tim is right, I also usually land manually, or rather just use
the localizer, err Mike G/S doesnt have a horizontal component
thats called the localizer.  But I was practicing some landings
this evening and just tried to follow the glideslope and it did
NOT follow it.  And, yes, I think i know how :)

Have no such problem in the 757 or 767 on the same approach,
this is on auto g/s, what is the manual supposed to do??

Its not a big deal to me as I prefer to land manually but it would
be nice to know what's wrong.