This could be caused by two reasons.
1. The account in linked to Skype, LinkedIn or Whatsapp of a person with the same name or phone number. In this case what you have to do is unlink the accounts in your address book. If you need help on how to unlink accounts in the address book let me now.
2. You added the photo manually, in this case just edit the contact and delete or replace the photo.
Cheers
Erasmo