Thank you for your bug report, that's a known gtk issue
** Package changed: gnome-control-center (Ubuntu) = gtk+3.0 (Ubuntu)
** Changed in: gtk+3.0 (Ubuntu)
Importance: Undecided = Low
--
You received this bug notification because you are a member of Ubuntu
Desktop Bugs, which is subscribed
** Attachment added: screenshot of the problem
https://bugs.launchpad.net/bugs/858918/+attachment/2457960/+files/gnome-control.png
--
You received this bug notification because you are a member of Ubuntu
Desktop Bugs, which is subscribed to gnome-control-center in Ubuntu.
Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: gnome-control-center (Ubuntu)
Status: New = Confirmed
--
You received this bug notification because you are a member of Ubuntu
Desktop Bugs, which is subscribed to gnome-control-center in Ubuntu.