We have been notified from the Joolz HQ that there is a design fault with the Geo Front wheel.
If your pram has been folded, while the front wheels have not been locked, the chassis will press against the wheel. If this is left in a very warm area, such as the boot of a car, this will result in the dents to your wheels.
If this is the issue with your pram, please send an email to email@example.com and provide them with your purchase receipt and and some photos of the damaged wheel.
Please make sure next time you fold your pram, you lock the front wheels before doing so.