@jamie771 there’s a similar but not the same issue posted in another thread and the common factor seems to be Contact Form 7. To eliminate other possible issues, have you tried deactivatig plugins except BuddyPress and changing to Twenty Twelve theme to check if issue is resolved?
We tried to change it to Twenty Twelve theme and deactivate all plugins including Contact Form 7 and still the same problem. As I already mentioned the only thing which makes the difference is when we deactivate Buddy Press Media plugin. Then we are getting broken links instead of duplicated messages.
@jamie771 Suggest that you post in the BuddyPress Media plugin’s support forums about this issue.
Already posted. They don’t know the solution so far either.