Originally Posted by kathy
I don't think I really understand what you're saying but when you fold the binding in half, both raw edges should be stitched down as one piece, then when you roll it to the back you have 2 layers over the edge of the quilt and a nice folded edge to stitch down.
I agree with Kathy. To fix this just open the corners, fold binding raw edges together, stitch the corners the same as you did the first time, turn and stitch down. Both sides should have a nice mitered corner.