Oh yes, it has happened to me several times. I have had to tear out all the seams to get it right. Now, I take my blocks to the board, and take one row at a time, I flip it right sides together right at the board, and take one pin and pin it before I remove it from the board, go to machine and check one more time. I think we just get carried away when things seem to be going so well and not pay attention to simple details. Good luck!