Health Mate miscalculates weight change.
This screenshot shows that I lost 0.9kg in January 2019 but have gained 1kg so far in February 2019 implying a gain of 0.1kg for 2019 so far.
However, this second screenshot shows that I have lost 0.5kg so far in 2019.
Today (5 February) my weight was 77.6kg and on 31 January it was 77.2 kg. So Health Mate should show that I have gained 0.4kg so far in February. To calculate monthly change Health Mate has wrongly compared today's date with 1 February when my weight was 76.6 kg.