I added my dry hops earlier today, and took a hydrometer reading, and noticed something strange. When I initially placed the hydrometer in the sample jar, it read below 1.020 (about 1.012), but after I'd spun it a couple of times it showed around the 1.020 mark. So I decided to take a reading using a refractometer, which showed a reading of 6.2 Brix. Given my SG of 1.055, I calculate that gives me a current gravity of 1.011. This is the first time I've noticed a discrepancy between my refractometer and hydrometer (they usually correlate very closely). I checked both devices with water, and both show 1.000 as expected. Given that the beer is very cloudy with suspended yeast, could this be interfering with the behaviour of the hydrometer? Possibly sticking to the hydrometer and providing buoyancy?