NPCs in your party and don't like being moved maybe? THough would of thought you cannot add NPCs in party to production. Maybe HAL has taken over and named you Dave?
None of the workers are in my party. I hadn't even left the factory, just the control room. Every time I go back in it seems to have gone up by 1%. If I hadn't had something else to do I would have considered repeating that action to get it done.