Look closely at the bolt in the center of the picture frame, look down to where it sits on the washer. Notice that it doesn'y look like any of the other nut/washer pairs visible. A portion of the nut facing the washer is visible and appears to be conical and extends a bit above the washer. That is only possible if there is no tension in the rod, which means the nut was not torqued down, or the rod has broken in two.
Yup. Enlarge thephot and note the distance from the nt to the Lok Tite. That rod has snapped and they backed off the nut.