I just bottled my first extract, partial grain DIPA brew. OG 1.086 FG 1.018 Fermtemp 66 degrees. When I carefully racked my beer from the fermenter to the bottling bucket, I only had 4 gallons of beer. I started fermentation 3 weeks ago with 5 gallons. I used a bucket for my primary fermenter, and didn't use a secondary. I would periodically check for a good seal, and always had one. Any suggestions on where to find my missing gallon of beer?