You may find it helps to use hair clips or the red sold clips which will hold the potholder and binding together while you sew. May I ask are you using at least a 2and half inch wide binding strip folding in half one and a quarter inch wide . Sew the edges down on the front, press over and down ready to sew.
Some say do a 3/4 inch seam I find on potholder s too large.