Hi Willy, I changed the team name: I went from CRUNCHERS SANS FRONTIERES 2.0 to CRUNCHERS SANS FRONTIERES. This modification has not been taken into account.
Also, I lost GPUGRID.net project stats in my team signatute. There remains only the WCG project. What should I do?

Team names are updated when they are exported by the projects. This is of course an issue with retired projects. Changing the name will have effect on the combined stats, you'll loose the history.

https://www.boincstats.com/stats/search/?search=CRUNCHERS+SANS+FRONTIERES

Thanks for your reply Willy!
Is it possible this has something to do with the WCG project not returning stats for almost a month? And that it recovers once the exports are restored?

When a project doesn't export then your team name will not update for that project.

Thanks for your answer Willy!