A possible technical explanation via BetAngel . I remember several years ago when the site crashed when the bet ID reached an overflow number - worryingly, it was a customer who picked it up rather than any of the techie brains trust. Slightly different here being on the stake, a figure which is input by customers, and concerning too. Best theory I've heard of why it happened. And by christ there are some bloody stupid ones out there!
A blog about betting, trading, sport and some of the dodgy elements within them. www.sportismadeforbetting.com.