Make primary (contacts' emails)

I ahave contact with 5 emails (including zoho:) ) I cannot change primary address from zoho to another. I have contact with 5 email addresses, now zoho email is its primary, i opened to edit a contact and want to change primary address by clicking proper 'star' naxt to the email address and then click on 'save' button. After this i got notification that 'email already exists' and primary address for that contact is still the same. I cannot even change this if i delete primary address from this account, because the first is set to be primary and still cannot change primary address.