In the following screenshot, the original line of the zone of control was one tile further to the southeast than is shown now. A Resoln city then expanded and pushed the line to where you see it now. After I took and razed the Resoln city, the zone of control from the two outposts did not snap back to where it should have been, and that odd one tile zone appeared. It's now 3 turns after I razed the city and the zone has not changed.
