Food Bug

[qarthadasht]

An issue i encountered in my current campaign is that while apparently the correct amount of food is produced, some provinces consume more food than there castle indicate. I checked the other buildings in the province to see if those consume food but apparently it is just the castle that should. After calculating, i should have a surplus of 11 food:

Level IV Farms: 4 Food x 7 Provinces = 28
Bonus through Chonindo Research.... = 2 --> 30
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Level IV Castle: 4 Food x 1 Province. = 4
Level III Castle: 3 Food x 3 Provinces = 9
Level II Castle: 2 Food x 3 Provinces. = 6 --> 19
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Instead i have a surplus of 1 food. Where are the remaining 10 food units?

Edit.: Ok, found the Reason with the Markets that consume food as well. Now it adds up.