Bookmakers latest software is giving a better line if the odds change in your favor while your bet is in the betslip. Its a nice feature and I've ended up with some nice numbers because of it.
BOL on the other hand will accept your bet at the odds that you put in the bet slip, even if the odds on their board have changed in your favor. But if the odds move against you the bet gets denied. One of their sneaky tricks I wish they would fix.