Proly old stock tht was kept in storage for far too long. U can check the shoe's manufacturing date on the label (usually on the shoe's tongue), then U know la. I've had this problem with NB before, with the outsole. The outsole came off after 2 runs, they agreed to replace, then the replacement shoes also had the same problem even before it hit the road. Then I made some noise on their FB page, they agreed to replace it with a different model of the same price. I went to their store in KLCC, decided on 890v$ Baddeley edition & now I'm on my 2nd pair At least something good came out of my ordeal.