The game loses tokens purchased when the exchange panel is opened. Situation A city sells 5 tokens agricultural and buy 1 token water. The balance is 14 tokens. So it perceives 14’000 units of money as sold token income. But if we open again the panel exchange once again, we will see that the balance money is 0 (first line) even if we are selling 5 token agricultural and buying 1 water . If we open the budget view we can see that the income (sold income) is now 20’000 even if we are buying 1 token water. Now it seems that the game continues to consider that the city is buying water. Indeed in play where a city is buying a lot of resource, the city doesn’t report no shortage. What it should do if the game was stopping to buy after having open the exchange panel. To correct te bug you have to sell a resource until we exceed the available cash or the amount of avaible token.