If they are visible on either side of the seam, that would be called edge stitching. For SID, your stitches need to fall exactly in that join. Take heart, this can be nearly impossible without lots of practice, practice and practice. Depending on my project I will try to maintain a good SID, but if I wander over to either side just a bit, I'm not going to fix it, as long as my thread is a great match. If someone wants to critique my skills, and get up close with a magnifying glass, they are contaminating my quilt with their bad breath.