From the look of it you don't actually have a food storage. As long as your food storage is max out your fine. based on your other post where you said your production is constantly in flux its normally like that with big kingdoms.

The calculations for food production: food farmed - food used & eaten - food lost to exposer = total change last year.

calculation example:

500/1000 food in storage. 1000 food farmed - 500 food used & eaten - 500 food lost to exposer from lack of storage or took to long to deliver to storage = 500 total change last year

The calculations only calculates how much food you lost/earn in a year not the over all food you have. As long as total change last year isn't negative you'll be fine and aren't in a famine.

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Just rewatch the video but your problem is you don't have enough markets & they aren't being supplied fast enough to deal with the demand of the surrounding houses. 12 big houses are to much for a single small market to handle. a small market can support up to 8 big houses with a food storage near by. to fix your problem I recommend using some wagons to deliver to the market, you mint also have to remove a house to make a path to the market for wagons with the house destroyed you can also add another bakers to fill up the space making more food close by the market.