I have a question, I am running Drupal 7.54 and CiviCRM 4.7.18. I have created an html template with 3 tokens (from Mailings->New Mailing) {contact.first_name} and the two required which are {domain.address}{action.optOutUrl}

My problem is that in html preview of the email, The contact.firstname points to the name of the sender instead to the 1 participant of the group in the mass-mailing option. I wonder why this is happening. Any clues?

The other 2 tokens are filled correcly in html preview