I've noticed an odd feature, that has now occurred in more than one game. On high production planets, in the late game, I'll be creating self-designed ships that are very powerful: perfect defenses, maximum weapons, great range, and lots of speed. I only need one or two fleets of these to hold my own in any battles, so the time usually comes when I want to delete them from the production queue.
But when I do so from the "Make Ship" dialog box, the planet won't reset to manufacturing "nothing". Instead, it'll switch to manufacturing rangers. This happens whether I go directly to the Make Ship dialog, or go through the planet management screen.
After a few games where I had way too many rangers for my own good, I finally figured out that I could use the governor screen to tell all planets producing rangers to produce nothing. That, at least, solved the problem.
But it's still odd behavior. Any explanation? Or is it just a bug? I would add that it only seems to happen on high production planets, and only later in the game, although I haven't done a scientific test of it.
Curious,
Alex