How is it possible that my pre boil gravity and post boil gravity are the same? I collected 7 gallons of wort and took a sample that I cooled and measured the gravity at 1.054. Then my OG before pitching with 5.25 gallons of wort in my fermenter was 1.055. I let the pre boil sample cool outside in an open container, would this have anything to do with it? Am I reading the hydrometer wrong? I would expect an OG of 1.068 or so with that pre boil reading. What gives? Thanks in advance for any help, this is my 2nd all grain and I'm still trying to figure out the science behind all this.