Not sure if this is a bug or I'm misunderstanding how the production bonuses work, but it is unexpected to me, so posting it here.
After I research a production technology, such as "Advanced Iron Melting," I see the bonus number in green go up, but it does not seem to reflect in the total production of that hut. Below are some before and after screenshots to demonstrate.
Above are the stats for my Iron Smelter and the time to fill it up.
Compare to the second set of screenshots, taken after researching Advanced Iron Smelting. All screenshots were taken immediately after collecting resources. Notice that in both cases, max capacity is 2250, and time to Full is 4:57:16 and 4:57:18, respectively. I'm pretty sure the 2-second difference is just that I was a little slower taking the first screenshot.
How can production go up by 13/hour, and yet, both capacity and time to fill it up is identical? It seems one of them should have changed.