Topic Reply Notification emailed 2 times

Does anyone else use the email option to receive topic reply notifications? I use it on basically every forum I'm on to keep track of threads I'm participating in, and on this forum I've noticed something strange which doesn't happen elsewhere:
I receive every topic reply notification twice.
Does anyone else have this problem?
If so could an admin look into it? Or suggest what could be causing it at my end?
I receive every topic reply notification twice.
Does anyone else have this problem?

If so could an admin look into it? Or suggest what could be causing it at my end?