The First Bug with the Dynamic Subject Line in Feedburner Email

Feedburner lately rolled out a feature wherein you can change the subject line of each email sent to you subscribers. This subject line is of course changing from each post title you post everyday. Read more about that feature here.

I took the plunge and availed of this new feature.

But of course, every first implementation will discover a but, or an error in implementation. An overlook, probably, on the part of the feedburner team.

As part of my feedburner "email" settings I checked the tickbox, "Send me an email whenever people unsubscribe (will be sent to your "from" address)."

However, lately, when some unsubscribed from my email feeds, feedburner sent me this message:

user@yahoo.com has unsubscribed from ${latestItemTitle}

Okay, could someone explain what is this? :D