You must not have successfully turned one in would be my guess. Your percentile indicates one area has not been completed. I also do believe there was originally a North Boston mission, not sure if the recent patch had placed it or not.
How many have you completed? I know you say "all" but I thought this at one time as well, but infact there were several I had not because they had not popped up on my map. There is 3 in New York and Frontier, and 2 in Boston.