First must ask have you calibrated your hydrometer. Cheap ones are not always accurate. Also different temptures will read different readings. Some hydrometer are calibrated at 60 degrees and some at 68 degrees. The packing it came in should tell you which degrees your hydrometer needs to be calibrated at. Here is a post I posted awhile back that will help you calibrate your hydrometer Calibrating your thermometers and hydrometer
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