I don't understand Trade Capacity

Here is a draft for your Reddit post. I've made sure to include the specific numbers and the confusion about the production vs. trade volume, which is the core of your issue.

Title: I don't understand Trade Capacity at all. Why does it keep scaling up?

Body:

I'm completely lost on how Trade Capacity works. I've been trying to get my available capacity higher than my used capacity, but it feels like a losing battle.

As you can see in the screenshot, I have built 1008 Trade Centers in Svealand.
The tooltip says "Trade Capacity Usage: 16239 / 16239".

The numbers just don't make sense to me:

1. It says I'm exporting 41,424 Engines. But my actual production is only around 5,000 Engines. Where is this number coming from?
2. Every time I build more Trade Centers to increase the capacity, the "Used Capacity" seems to just jump up to match it immediately.

I can't figure out if I have way too many Trade Centers or not enough. How am I supposed to read this? Why are the trade volumes listed in the tooltip so much higher than what I'm actually producing/consuming?

Any help is appreciated!

https://preview.redd.it/nk05cgec67ag1.png?width=963&format=png&auto=webp&s=493a585ea56870c7ea7a51a9313d039b6e79e595