I'm getting 3 mails / new message after clicking 'Follow this topic' ....

I'm getting 3 mails / new message after clicking 'Follow this topic' ....

When I have clicked 'Follow this topic' I receive 3 mails / new message.

One real one with a subject: 

New response to Max-width isn't set in IE


But two with the following subject:

Re: [WatchList] Max-width isn't set in IE


Christophe