Do you mean production, i.e., the number of shields?
My guesss is that you are experiencing "We Love the King Day." The citizens of those cities are very happy with you, and express their appreciation by dramatically curtailing corruption and waste... thus giving you higher production (shields) and taxes (gold).
Happiness is driven by a number of factors, including garrison (keeping military units in the city), happiness buildings (temples, colosseums, cathedrals), luxuries (including the multiplier effect of marketplaces), and certain GWs. There are a number of other factors as well, including war status, foreign citizens, etc.
Big subject...
Read the threads. The BEST advice I can give you is get every luxury you can lay your hands on, whether through territory / colonies and roads, or through trade.
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The greatest delight for man is to inflict defeat on his enemies, to drive them before him, to see those dear to them with their faces bathed in tears, to bestride their horses, to crush in his arms their daughters and wives.
Duas uncias in puncta mortalis est.
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