I've used Promash for years, but recently downloaded Brewtarget because it's free and has sorghum as an ingredient. I created a recipe for a 2.5 gallon 1.056 batch and noticed the IBUs were really high. I decided to put the same hop bill into Promash and the IBUs were roughly half of what Brewtarget showed (I'm assuming 0.89 IBU/GU = 89 IBU in Brewtarget vs 48 IBU in Promash). I confirmed both applications are using the Rager formula.
Am I missing something?