What social policy reduces border growth via culture?

What social policy reduces border growth via culture? - Mock up poster near green plant

The city contains a monument that generates +2 culture. However, the net Culture says zero. The tooltip for Culture +0 says "-2 from policies". What policy causes the -2?

http://imgur.com/v3Fbfk3

This city was originally Ghandi's capital. It was taken over by Ashurbanipal. He offered it to me to induce peace. I annexed it and purchased a Courthouse.

If I purchase a Pagota, which provides +2 culture, the city produces a net +2. Whatever effect is applying the -2 seems to be a flat -2.

Update: Screencaps of current policies and tenets here: http://imgur.com/OS3M73q,2ZLNu8u http://imgur.com/OS3M73q,2ZLNu8u#1






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