Ok guys, i know how to fix your problem. Sorry for bad english, but i try to help, try to UNDESTAND ME
You have 2 options, 1 option is with software, and 1 option is in game.
1.OPTION - "IGE" or "IN GAME EDITOR" can fix your think. How ? Just download from steam, Enable mod, then you can see on "top/right" angle of your monitor, you can see "IGE", click on IGE and then wait little, and you can see screen. You need to find city with "buggy production" and then edit your production from your city. This is resolve this bug 100%
- OPTION - You have one trick without software. Going to city where is bug, click on city, then click "purchase", then on "left/down" of your screen, you have option "BACK" and option "PRODUCE", you need just click on PRODUCE and check what your city PRODUCE. I know only this 2 for me usefull things, this error i got becouse i have lot of mods, and several mods no work together, or some mod no work properly. If you want to test your mode full, you must play from ancients time, to the future... Then you can know your mod/mods work 100% good. I think i help you guys, this things help me a lot :)
BRABUS V-12 Bi-Turbo