This is my output:
$ gsettings get org.gnome.desktop.input-sources sources
[('xkb', 'it'), ('xkb', 'gr'), ('xkb', 'de')]
Obviously the command "setxkbmap it" solves the problem, at least for the current session.
In Italian keyboard, for example, round brackets are above the numbers 8 and 9, instead of 9 and 0.
The issue arose after updating the following packages:
Start-Date: 2020-02-28 00:30:26
Commandline: apt upgrade
Requested-By: domenico (1000)
Upgrade: libqt5test5:amd64 (5.12.5+dfsg-8, 5.12.5+dfsg-9), qt5-gtk-platformtheme:amd64 (5.12.5+dfsg-8, 5.12.5+dfsg-9), libqt5dbus5:amd64 (5.12.5+dfsg-8, 5.12.5+dfsg-9), libqt5sql5-sqlite:amd64 (5.12.5+dfsg-8, 5.12.5+dfsg-9), libqt5widgets5:amd64 (5.12.5+dfsg-8, 5.12.5+dfsg-9), xkb-data:amd64 (2.26-2, 2.29-1), libqt5xml5:amd64 (5.12.5+dfsg-8, 5.12.5+dfsg-9), libqt5printsupport5:amd64 (5.12.5+dfsg-8, 5.12.5+dfsg-9), libqt5concurrent5:amd64 (5.12.5+dfsg-8, 5.12.5+dfsg-9), libqt5gui5:amd64 (5.12.5+dfsg-8, 5.12.5+dfsg-9), libqt5core5a:amd64 (5.12.5+dfsg-8, 5.12.5+dfsg-9), libxml2:amd64 (2.9.10+dfsg-3, 2.9.10+dfsg-4), libqt5network5:amd64 (5.12.5+dfsg-8, 5.12.5+dfsg-9), libqt5sql5:amd64 (5.12.5+dfsg-8, 5.12.5+dfsg-9)
End-Date: 2020-02-28 00:30:33
In the meantime, I think I will downgrade the package...
Regards,
Domenico