Pitting and cobble stoning post FUE, is possible to repair in some way?

It is best to ask your surgeon about post operative issues.   Scarring and pitting can be an issue after surgery.  It doesn't go away.  It may affect the growth as it is scarring tissue. 

You will have to look in to having a repair job done. I'd spend some time researching the top clinics in the U.S. and send in some photos to have an evaluation.

the most important point is "when" it happened. ıf cobble stoning is just after surgery lets say in 2-3 months , yes it would be heal.  but if that is seen after a couple of months after surgery , it means that it is permenant.  pitting and cobblestonning may have affect on regrowth of hairs

Pitting and cobble-stoning in recipient area is due to poor graft handling and placement. It is generally permanent and may be masked by hair that grows in later. Hair regrowth depends on graft handling during excision and placement and storage while outside the donor area.

When this happens it reflects the surgical technique use. I would return to your surgeon and inquire with him/her about the problem that was created by the surgery