Description of problem: Icon that ettercap package puts to /usr/share/icons/hicolor/32x32/apps/ does not have 32x32 size. This results in garbled menu in XFCE. Please resize that icon. Version-Release number of selected component (if applicable): ettercap-0.8.2-2.fc23.x86_64
You could probably leave only /usr/share/pixmaps/ettercap.svg icon. This icon is also used as application icon.
See also https://bugzilla.redhat.com/show_bug.cgi?id=1228834
*** This bug has been marked as a duplicate of bug 1228834 ***