Commentaire officiel
That is the difference between the regular processing which is really 2.5D and the Full 3D processing which actually renders the sides and overhangs. You can read more about that here:
https://support.dronesmadeeasy.com/hc/en-us/articles/207855366-Full-3D-vs-2-5D-Processing
Also, be sure to opt to create the Full Resolution OBJ in Step 2 of the uploader if you are interested in the 3D outputs.
With your orbit flight path you certainly have too much overlap.