The invention of certain technologies at a certain time had effects that didn’t match the prediction and they don’t know why. Someday somebody will figure it out and the model will be better.

Also known as “being wrong”. Being wrong is fine. It’s great even. It means that there’s more to discover and improve. Calling it a “paradox” is a pathetic, self-serving attempt to save face when presented with evidence that makes them look bad. Instead of saying “We don’t know, but we’re working on it,” they pass it off as unsolvable.