I’ve had this happen twice now and I’m not sure why....I start on the right Side of the head and both times it’s happened on the right side. I make sure to tack down the ends so there’s no flap...I’m thinking maybe I tack it down too close to the end of the weft where I’m only catching a few stands in it and it slides off somehow. I make sure there is no flap at all when they leave and somehow it comes undone on the corner. It’s tracked down on the first bead but the weft in front of the bead is up. Any suggestions?