With Event Tickets and Event Tickets Plus, you have the ability to move tickets (RSVPs and e-commerce tickets) to other events and to move attendees to other tickets. (You can read more about it in the Moving Tickets article.)
If you would like to disable these notification emails, then all you need to do is add the code below to your theme’s (or child theme’s) functions.php file, or as a snippet to the Code Snippets plugin:
add_filter( 'tribe_tickets_ticket_moved_email_recipient', '__return_null' );
This will remove the recipient’s email address and the email will not be sent.