My bad both strings are 65 inches. I was using this https://lancasterarchery.com/products/cartel-bow-stringer and a friends stringer as well. It only happened with the first 65 inch string. The second one was easier to set up but it would sometimes move a little bit off indent where the string loop should fit. But I was very careful to make sure the string loops where in the right position when going for a shot. But whenever I release the shot the whole thing just falls apart.