I fly quite a number of non precision approaches using vnav lnav and in good weather it can be startling how far off the papis and extended centreline the aircraft can be just above mdh.
That is why there is the NA below. Especially relevant when ICAO lets you go to 2.5 GPA at NA below.
Hopefully, when you say being far off of extended centerline, you mean vertically, not horizontally.