After some confusion and some research, I finally discovered the core of this problem.
When you activate the “Rationing” Policy on the town center, people eat 50% less food.
However, once you do, the 12 months report does not update the reduced consumption of food, and displays numbers and graphs that are seemingly mathematically impossible:
I was seeing this consumption despite my smoked meat stocks going up each year. This is because the consumption numbers and graphs above are bugged: the real numbers are half of what is displayed. Happens with all food types.
I tested the 12 month report with the “Teeth of Jonia the Ascetic” on the temple, and the same problem happens there. The reports show 15% more food consumption than reality.
Thanks for reading. Happy holidays! 