Share 'cords on chocolate bars:('

dear joe, I'm really frustrated today. I've been tempering chocolate many times, I've made chocolate bars and truffles. but today, for the first time all of the chocolate bars ended up with weird cords on top - the part inside of the mold, means the top of the bar when turned around, turned out nice and with a brilliant shine to it. but the upper part/ the bottom of the chocolate bar had all thes…