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Bottom line: its impossible for the gravity to decrease during boil. You only evaporate water, leaving an increasingly sugary solution. So there is an error with your preboil postboil or both gravity readings. Most common reasons for incorrect readings: Incomplete Mixings Failure to to a temperature adjustment Related to the second - Uncalibrated ...

from where did you take the sample? I am guessing you hadn't stirred the wort before you took the sample from the bottom of the brew pot, where the gravity will be the highest.