I believe it has to be a bug problem. I hope the picture shows the error. I just purchased GalCiv2 Gold Edition and was playing Dread Lords in a tiny map. The version was 1.5.
How can a minor race have such a high military production rate?

The second one was either oversized or undersized freighters, but they all followed the trading routes. The one was an Arcean freighter. At first, all were tiny freighters following their routes. Then I reloaded the game to play some more, then Arcean freighters became oversized following the routes.