You did say presumably, and you would be correct that the light is on the left. Sorry about any confusion but yes the light on the eggs in that photo should be pretty even because in that one the light was about 8 feet away. (I probably should have said that in the post) Once the light gets farther away it takes more distance to see a difference.

In this one the light is at about 2 feet from the eggs. I hadn't thought about this until you said something but the egg on the right could be showing more surface with light because of the angle to the lens maybe using a telephoto lens might have a different result with the light egg on the right and the shadows of the egg on the left.