Something seems to be off with the grouping. If you look at Chinon (France) there are 2 different statuses, but 3 groups. A1 is not grouped with A2 and A3.
If you hover on the center of the circle you'll see all of the Chinon blocks (they're 7: A1-3 and B1-4). You can search for "Chinon" to see them on the list or just click the circle that will scroll the list to the section where all the blocks are visible.
Will try to find a more intuitive way to show the reactors that are located in the same place.