Many years ago, I raced in SCCA National sprint races. I later assisted a friend who liked to drive his street car at SCCA solo events. There always seemed to be a lot more rollovers and mishaps like this at the Solo events. I guessed it was a combination of less stable suspensions, and driver experience.
I remember once at a solo, a fellow rolled his girlfriend's brand new car. Nobody was injured, but both were extremely upset. They were considering pushing the car down an embankment somewhere, and telling the police that the car had been stolen. Don't know how that ever worked out.