Groups of Applications in GNOME3 changed to KDE style... :S

Hi!
I use alternatively LXDE, IceWM and GNOME3 (in the same computer)… The menu of the first two is derived from KDE, but today I noted that my gnome-shell showed in the applications tab the same groups and icons of them… and not the usual grouping of GNOME…

Does anybody know what could have modified that groups?

Regards.