Perspective, slopes and a very bright floor.
Parallel lines in the real world can converge in a photo, like railway tracks. Shadows falling across bumps and slopes bend further. Royal Museums Greenwich uses this to explain the Apollo shadows. [1]
The lunar surface reflects a lot of sunlight, and so do white spacesuits and the lander’s foil. That reflected light brightens shadowed areas, the way a photographer’s white reflector does. [1][3]
In 2008 the MythBusters built a scale model of the Apollo 11 site and lit it with one lamp. They reproduced both the angled shadows and the lit astronaut in shadow. [2] Several studio lights would also create several shadows for each object. No Apollo photo shows that.
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