Contact dissapeared, then impossible to re-create

Hi,

The following happend to me :

- One of my contact dissapeared suddenly, his name/email didn't show up when I tried to write him an email. After I checked on Zoho Contacts and he was gone from the list.
- Then I tried to re-create the entry for this contact but I get the error "Contact email address already exist"
- As a matter of fact, this contact doesn't exist anymore, and his email is nowhere in my whole contact list, I tried search of his adress which returned nothing. Same with csv export, his email is nowhere. Still I cannot recreate him...

NOTE : I just noticed that the contact DOES appear in Zoho Desktop in the Contacts widget. When I click on him and get to Zoho Contact, he's nowhere in the list.

I hope this is clear enough, can you help me ?

Thanks