Superga COTU Classic navy sneakers

Supergra COTU Classic Sneaker , navy. Size 39 (8.5). Lace-up front Cushioned footbed Canvas upper Rubber sole Love these shoes, but I really should have bought a 9. I have never understood why the sole turns funky (see pics), but they are not worn down at all. I tried to capture how good of condition they are in through the pictures.