According to what I've been reading the first addition of hops at "first wort" to kettle as opposed to adding at start of boil for 60 min. Should add about 10% to the IBU calculation but a "softness" to the hop flavoring according to some. But when entering a hop addition as "First Wort". Instead of Boil for 60 min. The BF program calculated the IBUs way lower... Am I missing something here or is there a bug in the program ??