For what it’s worth, I don’t think it unreasonable for the other posters (and I) to assume this is a bug, rather than a feature. It isn’t documented on the product page or manual, isn’t present in other sceneries, and terrain elevation issues are pretty common in FSX (especially with third-party meshes installed).
Personally, I don’t like the “feature”. With EZDOK’s landing effect turned on, these bumps don’t so much feel like little imperfections and undulations in the taxiways and runway, so much as it seems the aircraft is travelling over a speed bump every ten feet. The way the view shifts with each bump is quite unpleasant. It would be lovely if there were a way to disable it… would that be hard to implement?