The reason is due to the geometry of touchdown aiming point vs ILS receiver and pilots eye height.
I was thinking more of those places where the actual glideslopes are set at different angles, visual vs. electronic.
Even in supposedly well-managed places there are discrepancies but this is presumably intentional due to the differing technical/legal requirements of obstacle clearance limits when designing precision vs non-precision or visual approaches?
Well, that was what was in my mind when I asked the question but it would be interesting to have some concrete examples.
Surely it would be better to just set all glideslopes for a particular runway to the same, e.g. the minimum required to give obstacle clearance, etc. using any of the means of guidance? Would save a lot of head scratching and possibly aircraft, as in the accident we’re discussing...