It can take 6 cycles or 3 days for the bounce to clear. Numbers can wobble around during the bounce. Or he might have hit bluesville again during the day today. Cats can bounce from numbers lower than they are used to, it doesn't have to be a very low BG. Some cats will even bounce from yellows if they aren't used to it. Over time and as he gets more used to blues, he won't bounce as high when he sees them.