Non Precision Approaches only use a pseudo glideslope if it is coded in the FM database or may just be flown using V/S or FPA modes on the F/D therefore when visual it would be possible to be following inappropriate F/D steering commands depending on how the approach had been flown.
On the Airbus, switching off the F/Ds forces the ATHR into speed mode which is "failsafe" Try researching the "Bangalore A320" crash.