I'm guessing you build 7 courthouses. Courthouses were overpowered before the patch. Annexed cities with courthouses gave you 3 lessthan the cities you founded yourself. They've fixed that. I don't know about the revenue, though.
I am going to make an assumption, and we all know what assuming can do.
A Courthouse costs 4 gold for upkeep if Anightdude had seven that would be the 28 gold differential. This is assuming that before the patch not only did CH's take the cities base unhappiness away but failed to charge upkeep.