I think you have defective tires where the sidewall rubber is too thin to retain the sidewall pliers. Those fibers extend down to the bead and if enough of them let go, your bead could separate from your sidewall. Similar happened to an old Specialized Turbo foldable tire I had. The sidewall latex dried out and ceased to hold the kevlar/cotton sidewall fibers together and they let go at the bead, causing the innertube to blow out of the sidewall at the section where the bead separated from the sidewall.