hummm…got something here. @Joaquim, looking you reference here Some issues with 3D plots · Issue #6741 · GenericMappingTools/gmt · GitHub, I tried a “+b” in -BWseNZ+b and voilà …
The answer as to why the z axis is shifted is the metric combination (z) with the projection (-JL) “deforms” the geographic plane over the bounding box created in figure . So the axis will certainly appear to be offset from the point of the figure.
