* Set "Line Size 0", otherwise the unmatched edge marking the problem will overlap what you are looking for.
* Zoom in very close
* You'll a looong stretched triangle overlapping with the other geometry:
3 212 -1.591 -30.16 -16.494 -2.097 -33.857 -13.395 -1.899 -32.322 -14.681
This triangle has to be deleted. It doesn't belong there.
w.
LEGO ergo sum