But this is not always true. Next time you gather, notice where most of the control area is. Naturally, use the longest stitch on the machine and sew from the right side. The two threads you pull are the bobbin threads which will be on the wrong side of the cloth. Pull them at the same time and push the cloth along the threads at the same time.
Nothing is more upsetting than to have everything just about in place and the threads break.
So push gently.