So I keep trying to lower the production of the engines as I keep winding up with extra stock, and it keeps reverting back to full production
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Experienced this as well. When you have the game automatically adjusting engine production to car production, you get about 15-20% more engines than you need.
And I cant get it to stop I have almost 100 extra engines now of each variant.
Edit: I think I figured it out, you have to exit the screen using the right arrow to lock in your changes
Found another minor issue,
When setting the production and markup when I set it real close to the threshold with a demand to production of 1.01 ish with the markets growing each month so its a constant 1.01 ish I still often have an overproduction in my cars.
I am pretty sure it is an issue with rounding where demand in one market might be 33.4 comes out to 33 cars sold, if your making 100 and each market does the same thing you will wind up with one extra car not sold even with the demand being higher.
There are far worse issues than that 
for instance the game not taking into account any other cars you currently have in production.
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