The Voigtländer folders are notorious for bending fragile folding standards.It looks noticeably better than both color skopars on my perkeo II ans E
Could well be it. And it might very well be impercepticely little. All it takes I one second of rough handling in any of the some seventy years of existence.
Not that the Certo is much better with it’s pantograph mechanism. But it is better protected perhaps.