I'm a new homebrewer and I just finished racking my second batch of beer, a one-gallon Irish stout from extract.
My first batch came out great, and made six delicious bottles. But, when I took the carboy out to rack the beer this time, about half of the original volume seemed to be missing - only enough for three bottles. There was also an unusually large amount of trub on the bottom, way more than I had in my first batch.
Both batches were the same kind of beer, from the same supplier, and I tried to follow the exact same steps.
What could cause this discrepancy?