Some package are shown twice in the "installed" view, like skanlite, kdenlive, calligra packages and the like.
I have the same issue on version KDE Neon 5.10.1 Screenshots: http://i.imgur.com/RDXnqTy.png http://i.imgur.com/VTu4vCo.png
https://phabricator.kde.org/D6191
*** Bug 380129 has been marked as a duplicate of this bug. ***