So after hours of readings, and after verifying my address and private key i assume that blockchain did generate  for me a wrong private key because i tried to export the wallet but in another blockchain wallet it said sync with the server but i cant see my addresses so i ve tried to use brainwallet to see if the private key checks with the address given but the private key himself is invalid.
i have all the backups of the wallet so tried them with offline brainwallet and the same problem from the creation of the my wallet the private key generated with the address is invalid but dont know why but the statue  of the address generated is not watch only because of the private key is invalid. its the only conclusion i can have. so can anyone help is it possible that this kinda problem happens ? or did i do something wrong ? ..