I am trying to send in my 2015, 2016 and 2017 tax returns. I did the 2015 and 2016 then 2017. 2017 says it was sent with a confirmation #. the other two is saying finish

up and file after you have reviewed.. well i have and keep trying to send 2015 and 2016 but its not working I got a confirmation 11 digits.. what am I doing wrong?