It could be possible that these stones were standing originally, but rather than fallen over, they were pushed over purposefully. I remember being told about a circle where the stones were actually pushed over by ancient peoples to signify a special event. The pushed over stones would have something underneath them to signify an event, death or some kind of incident. Prehaps even, the stones at Arbor Low were pushed over to mark the death of the chappie who was buried there!! Or prehaps as someone said, they were badly put up and fell over. The soil at Arbor Low is very shallow and below is rock, prehaps the shallow soil could not support them. xxx