Negative Imprint, wrong position:
The distance is good but one of the dots around the green starting point is outside of the imprinted area, and two of the four dots that should be on the flat foam are outside, thus, slanting the scanning box.
Negative Imprint, good position:
The foot gauge is well centered, all three dots around the green starting point are in the imprinted area and all four dots that should be on the flat foam are corrects. The distance is good, confirmed by the green starting point.
Dorsum, wrong position:
The foot is out of the foot gauge, hence, one of the three points around is on the foot instead of being on the flat surface, causing a slanted scan box.
Dorsum, good position:
The distance is good, confirmed by the three green dots, that are all on the flat surface. The scan box is well positioned.