So Ive been playing that same game I was in before and I wanted to test Charisma so I left some champs(not my Sov) in a settlement for a great number of turns. Also, to see if the 10% admin bonus works, which it does.
Turns out my prestige is negative now (-1) which is frightening, to say the least. I guess Ill play further and see if I can fix it otherwise Ill just raze the city...
On second thought, after alttabbing back into my game, maybe the prestige -1 is because i'm building something at the moment. Ofcourse, it seems like it should be prestige 0 but I dont know, I need to look at this more.
Another alarming feature of this one city is that the build types are greatly exaggerated. 20 turns for a granary? I saw some scaling in terms of build times on other cities but everything in this city is about 20 turns now.
I just destroyed magnar's empire... the magnarites or whatever they're called and prestige is normal and so is build times. So maybe the problems I had were an enchant? But then, if they were, I'm not sure when Magnar cast them seeing as how he was so gimped in the learning skilsl aspect because I took all his stuff. Not to mention I'm not entirely sure he'd ever had a unitnear the settlement in question.
Another edit: Or maybe it's food. I just got a f point boost to food after building a farm. The farm was built one turn after everything went to normal though; the turn after I took the magnarite capital.