Yes they are at 0,0,0.
It's all down to the discrepancy between XYZ and spherical mapping ... I think ... maybe.
All fractals seem to get stretched around the equator.
My somewhat "hacky" solution to this is to create whatever terrain/displacement I want at the poles (0,0,0), limit it with a simple shape shader, and then use a translate (rotate) node to move it to the equator or where ever you want it.