Hi Jerome,
Thank you for your patience.

I am sorry, that is a bug. Please remove the code I supplied earlier(It was a mistake, I supplied code from profile data control and not moderator).

The problem is happening because BuddyPress ignores the xprofile data and uses WordPress user meta data for these ignoring some of our actions. This happens when you use a mapped WordPress field(Biography, first name, last name).

I am working on a solution, please expect a plugin update by 21st.

Thank you
Brajesh