I believe am having an issue with the Raider resource gain negative. I picked Farmer initially, then..

I believe am having an issue with the Raider resource gain negative. I picked Farmer initially, then switched to Raider at level 6 or 7, didn't like it, so rushed myself to level 10 to get the free change, and changed myself back to Farmer. I am still getting -30% resource gain on Food, Fuel, Wood, and Iron. Specifically on Iron, the game says that I am supposed to have +40% between my Production Center's 10% and my technology's +30%. Is this a known bug, or is something else going on that I may not know about?