I'm also facing a similar issue. Whenever agent sends the last reply and closes the ticket, an email is triggered to the creator. Now the issue is the last reply automatically posted multiple time. There's no pattern in terms of duration of posting replies as varies between 2-5 minutes to 10-15 minutes. This also happens with only one agent from the entire team. I tried clearing cache etc. but no luck. Once or twice this issue occurs for any random ticket.
I'm also attaching the screenshot.
You can see in the screenshot that the reply by agent was at 12:31 and then ticket got closed. All the responses that you see after are created automatically. Not sure how.
Can someone help here?