Hey Derek! Is it a defect r error? Not so sure, It is pretty much the same as the Jabo buttcrack. Not sure if was wanted but just part of the process when the stream got smaller than what was needed for a seam at each end with pelts and vitros, and too big to produce swirls in Jabos?? I have a box of Akro Tri-Colored Agates and over a quarter of them are folded, For some reaso it very rarely ever happened with Master Mades. I have only seen one and I sold it for pretty good coin.