Good day,
I corrected the elevations of Groot Paresis North and Groot Paresis South back to elevation from sources: Topograpgical map 1:50K 2016AD and trigonometrical beacons T034 and T045.
I think your given source "Namibia Tourist Map" might have an error there.
See also:https://namibia-topo.openstreetmap.org.za/#zoom=13&lat=-22.73361&lon=17.03556