The last two AG beers had what I believe to be small increases in SG from "Into the Brew Pot to Into the Fermenter". For example I did a Pale Ale that had a Pre-Boil SG of 1.043 and an OG of 1.048. Beersmith estimates were 1.036 and 1.051 based on 75% efficiency. I did a strong boil for 60 minutes. Assuming that my measurments are correct, what are the factors that could cause this?
Are you asking why you are getting an increase or why it doesn't match beersmith? If its' the latter, a couple things come to mind, different pre and post boil volume than beersmith, also different evaporation rate than beersmith.