Last night I happened to check in on the cultural progression of one of my smaller cities, and noticed something strange. At the top of the city screen, it showed the city producing 2 culture/turn. However, at the bottom left, where the improvements are listed, it showed that the temple was producing 4 culture/turn. I was not mobilized for war, and I checked it each turn for about five turns. It did finally go back to 4. Has anybody seen this, or have an explanation?