Help understanding this image of an unusual double reflected rainbow
What you are seeing are a primary rainbow (rainbow #2 in the linked image), its secondary rainbow (#4), a reflection rainbow (#1), and its secondary (#3).

Note well: The linked article called these reflected rainbows, but that is incorrect. A reflected rainbow is yet another atmospheric optical phenomenon that occurs when one sees what appears to be the reflection of a rainbow on water in front of the viewer. The water was behind the photographer in the linked image, and the extra two rainbows were in the sky rather than in the water. (There is no water in the linked image.)

The reflection of the Sun off of the water behind the viewer result in a reflection rainbow in front of the viewer. The center of a primary rainbow is the antisolar point from the perspective of the viewer of the rainbow, which is below the ground. The center of a reflection rainbow is the anthelic point of the reflection of the Sun, which is above the ground. Thus rainbow #1, the primary rainbow from the Sun itself, is lower than rainbow #2, the primary rainbow from the Sun's reflection off the loch behind the photographer. The two rainbows intersect at the ground.

Rainbows can have secondaries, and so can reflection rainbows. These are bows number 4 and 3. Note that the sky and land are darker between the primary and secondary, brighter outside the secondary, and much brighter inside the primary. The lighting outside the secondary is the natural lighting level.

One way of looking at rainbows is that they transfer some of the light that would normally fall between the primary and secondary to inside the primary, and that this transference changes a bit with frequency.