The Nano Fabricator tooltip displays "+25 Planet Production" when in reality the bonus is "+100 Planet Production".
"Nano Fabricator" now gives 100 manufacturing overflow."
Galactic Civilizations III v3.95 Change Log.
Also the bonus indicated in the changelog does not exist (nor is it indicated in the tooltip, but there, it really does not need to be there).
""Nano Fabricator" now gives a +10% Max Manufacturing bonus to the planet."