I have started my fitness journey a month ago, by not drinking sodas any more and after that I have started to add more exercises to my life and a bit healthier diet. I have started to lose some weight (orange on the picture), but suddenly one morning my body fat percentage (green line) jumped from 25.8 (at 82.9kg) to 30.8 (at 83.2k) compared to previous morning and stayed above 30% ever since. I bought my scale in april and nothing seems to be broken and the weight is seemingly being shown correctly.
EDIT: The answer to how is this possible is that the scale at some point changed settings to a woman, after setting them back to a man, it shows again values around 25%. So why does the same weight shows body fat % different for men and women?