Originally Posted by weirdboy
I guess you have some weird setting for efficiency, and you didn't select "Extract" as the recipe type, as you should have, because then you'd get extremely wrong numbers that would make it obvious you were doing something wrong in Beersmith.
It looks that way, but I downloaded the actual beersmith data file and in there, he has tweaked those ingredients to be LME and DME, and the recipe is set as Extract. The numbers might be off because of this, but they aren't off enough to make the difference between 21-25 and 35-40 IBUs. I tried swapping those modified ingredients for the "real" thing and it made a small difference---1.042 vs 1.040 OG. Nothing significant, in other words.
If you switch the bitterness formula to Garetz instead of Tinseth (the default) or Rager, then you get a number in the mid-20s. That might be the difference.