when i stop at 1/4 from the edge and pivot, i then fold my binding even with the raw edge of the quilt and i actually start sewing just off the quilt edge.
some quilters tell you to start again right on the 1/4 area where you stopped before pivoting. it's hard to do. sometimes if you mis-judge you end up with a little space that isn't sewn down when you turn the binding toward the backing.
so i started sewing while off the quilt and no problems like that since.