It's a bug. Or must be a bug. They forgot that University research exists to increase NTG chances for four NTGs (e.g., in Uni Wu has +20% tea, porcelain/marble/scrolls have +10%); and it appears these values are being treated as making them the only possible NTGs to get. In other words, +10% chance of porcelain means +10000000000000000000000% chance of porcelain.
This is a major problem.
In the meantime, use Bjorn.