Are you EPP? Be sure your pieces are secured to the papers. If you are not EPP and doing them with open stitches press them well as you connect them. I do not do EPP for the most part as the papers are in my way. Also I am left handed and that does make a difference when stitching things together. Be sure to mark well you joint points. That also will help you. This is a quilt of precision. Go slow, I am sure you will get it.
It has been a while since I made a GMFG quilt. The one in my avatar is a King size one I made. It was a travel along project that went with me to appointments and the such or long car rides. Great project for travel