This is a strange one, but I've recently been wearing a pair of brogue-alikes (buckminsters by visvim - I know, not proper shoes) - but after a few weeks wear a weird wrinkling has started to appear on the inside of the quarter and heel - not the usual creasing that appaears at the toe but a noticeable difference in the texture of the leather. And this has only happened on one foot. On the other, the leather still appears to have a waxy, shiny and non-creased...