This has become more of an issue in the last few years. Your horse could be 5-1 when the race goes off, but will click down to 7/2 once the race has already started and the final clicks have been tallied up. Very frustrating but it happens when you have whales betting online and wait until the final possible minute to jam their bet in....on the flip side, you sometimes can bet a horse at 3-1 and have it go up to 4-1 or 9/2 after the race starts also