Created attachment 112010 [details] Discover (photo) There are duplicated apps in installed applications
This is caused by the duplicated apps not having AppStream IDs that match. It's a general problem, and one that needs to be solved by app developers and distros. If you'd like to help out with this effort, please see https://pointieststick.wordpress.com/2018/01/14/how-you-can-help-drive-flatpak-adoption/
See also https://bugs.kde.org/show_bug.cgi?id=402093, probably related