Double reflected rainbow photographed in Orkney.
Double reflected rainbow photographed in Orkney - BBC News
There don't seem to be many details. I hope it's not just down to dodgy photography - photographing it through a window and capturing the window-glass reflection, for example.
If it's genuine then the likely cause was was the brightest double arcs being caused directly by the sun, and the dimmer ones by a glancing reflection of the sun from behind the photographer - this could have come from large glass panels - greenhouses or solar panels, or perhaps a reflection from a lake or calm sea.