Getting a strange message sometimes when trying to post

[NorbertDentressangle]

I'm typing the message in the box, then when I click post I get:

Mumsnet Discussions : $topicname : $threadname : New Message

By $user.Nickname $message.DisplayPosted
$message.Message

Norbert - by Friday, the roof should be completely finished - HOOOOOOORAY. The plan is to move in at the beginning of Feb, so maybe we could aim for a meet-up at mine, sometime around Easter? What do you think? Are you on facebook? There are loads of photos there? If you are, I'll cat you to get your e-mail address.

Helen - thanks for cracking the whip over BigTech.