Question title not showing in Buddypress activity stream, username instead

Hi,

It's not a "new problem" but I never had time to look at it at all, so here it is:

On Buddypress activity stream questions title are not showing. This is username instead.
That's the same for answers.

You can have a look here:
http://www.oreille-malade.com/quoi-de-neuf/

Link is OK though.

Any idea?
Best Regards