Issue with date blogs entry

im not sure if this is a design issue or buddypress, wpmu issue
as you see here, she has write a new blog entry but the date is all mixed up
CarolineJosee1971 a écrit un nouveau billet: Des règles écologiques! il y a 6 jours, 1 heure ·

It mean 6 days 1 hours but the blog has just been written 45 minutes ago. so her new entry do not appear in new blog post widget

any ideas?