Scenarios seem to be buggy in this way. I've noticed this in my scenario, and also the problem that pollution sometimes isn't calculated for all civs, or distance from capital being calculated for all civs. But then at some other time I check and the problem or problems are gone. I think there are some things I'm doing in cheat mode that are having unintended consequences but I can't figure it out exactly. Some of this is obviously very buggy. The key is capture a moment when everything is working, and release that as your scenario
. I had everything working, but I was just told by a playtester pollution has turned itself off again. Grrr.