I brewed a Kellerbier today, using a Brewer's Friend Community recipe. I think my measurements were a bit out as instead of an OG of 1.054 I got 1.066 but slightly too low on the volume. No problem I thought, I'll just liquor it back and there will be more to go round. So I added 3L boiled water (put through the counterflow chiller) to bring 22L to 25L and expected the OG to drop from 1.066 to 1.058. Took another sample and it was still reading 1.066 (using the hydrometer). How come? Does the wort settle in strata with the denser stuff at the bottom? I'd only just filled the FV from the counterflow chiller and it was falling from a reasonable height to get the oxygen incorporated, so presumed it was well mixed. Anyone else had something similar?