Did you cool both samples before measuring SG (or otherwise correct for temperature)? Hydrometers are calibrated at specific temperature usually near room temperature ish.
Yes, I did cool it to 20C first time and to 19C the second time. The wort had a lot of sediment though, probably due to 30% of flaked malts. It was clearly visible that the sediment was getting down to the bottom and the upper part was clear wort.
I bought some distilled water today to test my glass hydrometer as per BrewBama's advice. It is concerning me though that both glass hydrometer and Float were showing strange numbers. I'll try to re-calibrate my Float as well, once I get it out of the fermenter.
Float is showing 1.007 gravity at the moment, but the foam in the fermenter is around 1.18 inches thick still and CO2 is there like crazy, hence I doubt that fermentation has finished.
I sent an email to Float support a month ago about strange gravity numbers and they replied that foam can be an issue though.
Just curious now what was the original gravity of my batch actually
I reckon I'll have 6% ABV for sure