In most cases bets get rejected by Layer if they don't match the parameters: liability limit is reached or price/odds have moved in the time bet was placed to the time the system has processed the bet. When a bet is placed, the odds are check so as the same and not suspended. The bet is either rejected or placed on cleared ethereum.  There is a delay in ethereum which means a bet can still get rejected as the odds are checked against the block mine time which can be  delayed (between 10 seconds or more) at time of confirmation - if the bet is rejected the stake is returned to the bettor. This is especially more common on bets placed very close to the start of an event.