Game name "4 on 4", Game ID 9822, city "NICs Temple" (near the top middle). Was able to send all of my cities to vector there, and a teammate is also vectoring there (which I'm guessing is what caused the error, but I don't know the order in which things were set up).
I haven't ended my turn yet, wanted you to check it out first and I'll make sure I set it back to 4...maybe