Replying to ticket generates new ticket

Replying to ticket generates new ticket

I've seen the previous posts before but my problem persists. When a user replies to a ticket the subject line looks like this: 
[Ticket: # ##2103##] Re: [Request ID :2101] : test
My notification email subject line looks like this:
[Ticket: # ##$RequestId##] $Title  
The more replies we do, the more 

 "Re: [Request ID :2101]" get added to the subject. How do you fix this?
 



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