Well, the images were all supposed to be taken with a camera pointed 5° forward of nadiral (which is the default for Map Pilot Pro which I use to take these photos), but when I look at the exifdata, the angles (there are 6, 3 for the drone, and 3 for the camera) look wild.
I have not tried to reconstruct the photo angle from the lat/lon of the camera and the image, but I wouldn’t be surprised if there are some bad data here.
So, it might be that my problems are limited to my equipment.
A