Without having access to the specific picture you are referring to, I can only provide a general explanation. However, if you could provide more details or describe the image in question, I might be able to offer a more accurate response.
Clouds can appear to be duplicated or mirrored in certain photographs of the Earth due to a phenomenon called cloud symmetry or cloud reflection. This occurs when a reflective surface, such as a body of water or ice, is present beneath the clouds. The reflection of the clouds on the water's surface creates a mirrored image, giving the appearance of duplicated clouds.
The effect is similar to looking at a reflection in a mirror. If you were to hold an object in front of a mirror, you would see its reflection as if there were two identical objects. The same principle applies to clouds and a reflective surface.
It's worth noting that not all images of the Earth with clouds will exhibit this phenomenon. It depends on the angle, lighting conditions, presence of a reflective surface, and other factors present at the time the photograph was taken.