There are a lot of issues around this on betting sites, for example there was a bet in the World Cup with Messi to have x amount of shots on goal , he took a free kick (if i remember correctly) from wide of the 18 yard box, had the keeper not tipped it over the bar it would have gone in, however these bets are paid out on Opta stats and they said it was a cross so not a shot on goal so b365 never paid out.
Edit - found the example