The Dorb (Dust/Orb) debate

Adam Wilkinson took this picture #2021 at Calvary with an HP Photosmart E327
What we find so interesting is that it appears the orb is behind the center stone cross.
Yet, the stone seems to have a curved indentation where the outline of the orb is.
The most pleasing thing was to find those exact marks in the stone in Adam's picture #2022, where the orb had disappeared.

Picture 2021 - orb behind a stone easily ten feet away:

Picture 2022 - the orb is gone:

Closeup of pictures 2021 and 2022: