Thank you so much Erwin, I found the culprint! You were correct, for reference I in Rhino imported using the Grasshopper Live Connection a few curves as linear morphs ( since I was having problems importing Archicad lines ), to use as visual references for the level curves on the model. They were all draw on the exact same plane in Rhino, such as this.
But for some reason, unsure if during import or some wrong procedure I did after, it was catapulted to cosmical scale, as you mentioned.
I am leaving the images to show in case someone else runs into the same problem. And it seems all morphs are taken into consideration for the section drawings, I at some point will make proper Archicad lines on simplified versions of the morphs ( since they were acquired by photograpmetry ).
Once again, thank you very much Erwin