Ticket Coming off Hold generates multiple emails

Normally users receive a single email notification for a ticket that comes off hold, but recently a technician received 3 for each ticket that came off hold (3 tickets in total): 2 that looked the way they normally look (from the reply to address) and then 1 that looked like this (coming from notify@teamdynamixapp.com instead). The message content was unchanged for all 3 tickets.

Any ideas why this may have occurred and where to correct it?

Thanks