Automation does not work for contact which was deleted several times

Is there any Reason, why a contact does not get sended Emails, when he was deleted for several times.

I use one of my Email accounts for testing new automations.

To run this contact in a new automation, I delete (not unsuscribe) it. And then I suscribed new via Startform on webpage…

  1. Double opt in Email → receives
  2. Autoresponder Email → receives
  3. Emails from Automation → does not receive, but on the dashboard is shown, that email was sent to contact ??

Is there any logical reason for this i does not mind?

Thanks in Advance
Greets Johannes