Well, there is always badly made equipment. Especially with carbon fibre. And one never knows how much steess or damage was done to said tripod before. Also, carbon fibre composites, because it is the composite that fails, not the fibre, fail catastrophically and immediately. They look fine one second and fail the next. Metalics deform before failing. Just because a composite part look (!) good, especially to the untrained eye which includes mine, doesn't mean it is actually good. Because composite parts don't show damage the way metalic parts do, no dents, no visible cracks, no nothing besides scratches in the surface coating.
Carbon fibre sells well so, because everybody believes it to be some light, indestructible wonder material, after all we build planes out of it! Just ask the Titan sub people...