Gap in Elevation Data

@Julien_DroneAlsace wrote:

We recently acquired a Reach RS + antenna to measure GCPs for drone mapping projects. We are testing this solution with a national NTRIP provider (Orpheon / France) to achieve centimeter accuracy.

This week, to verify the good functioning, I measured known points that we had collected 6 months earlier for an old modeling project (using a Leica antenna connected to the same NTRIP network).
The precision obtained in XY is centimeter, there is a difference in average measurements less than one centimeter.
However, the elevation data show a difference of about 47m.

GCP1 LEICA 7.75957778 48.58578098 141.277
GCP2 LEICA 7.76043817 48.58616646 140.823

GCP1 REACH 7.75957757418 48.5857807328 188.977142009
GCP2 REACH 7.76027878753 48.5860843939 188.598433953

Can someone explain to me how this gap is possible? Knowing that the elevation data from the previous survey are correct.

Thanks in advance for your answers,

Julien

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