Hi there and welcome to the forum
No i havent noticed such dramatic wicked bug mmmm... Thats really grosh May i ask the cost of your units of few exempels? my upkeeps of units are from below 100 to 300 and such and more, can happen i mix up units betwin Shogun and FOTS.. But i dont see any kind of extrodenery unit keep prices mmmm.. What i have discoverd and i do pretty think many knows that u can have diff prices on your units, deppendly of how your province look like and wish extra bonus buildings you decide to build. But if that changes in the upkeep as well i really honestly didnt look up, incase one of the same unit was built up but in 2 diff provinces with diff prices, i mean if that makes any sense and diff in there up keep!? Hmmm.. I really have no idea. Give us a short list of some units, and i will give you a valued upkeep answer of them from my FOTS campaign
And how to fix this wierd annyoing bug :-o I have no idea... I do hope others will report and with knowlege and possibly solutions. Going down like 5000 in cash minus is a huge handicap every turn i agree.
BR AN.