Should only be unmatched lay bets being cancelled (unmatched back bets become less likely to match, so there's no need for BF to cancel them).
"In the win market: if the reduction factor of the non-runner is 2.5% or greater, the traded price of all the matched bets on the remaining horses will be reduced by an amount equal to the non-runner's final reduction factor and all the unmatched offers to lay will be cancelled. If the non-runner's reduction factor is less than 2.5%, reductions will not be applied and unmatched bets will not be cancelled."
Should only be unmatched lay bets being cancelled (unmatched back bets become less likely to match, so there's no need for BF to cancel them)."In the win market: if the reduction factor of the non-runner is 2.5% or greater, the traded price of all th