SUMMARY
Once flatpack repo was added, duplicates were created of apps, unable to uninstall those flatpack (if not worked such as steam) then unable to unintall or disable flatpack repo at all. 

STEPS TO REPRODUCE
1. Enable flatpack repo
2. install some app that already exists
3. try to either disable repo, remove repo or remove apps

OBSERVED RESULT

Duplicated of apps created, updates unable to be applied (tries without sucess), unable to remove or just disable repo in Discover

EXPECTED RESULT

Filtering out apps if already exists in default repo (witch is rpm, never enabled flatpack as default) then possibility to filter/see witch app were intalled from rpm witch one flatpack. Remove repo or disable if necessary. Possibility to filter flatpack/rpm without disabling repo completly choose the sources rpms/flatpacks.

SOFTWARE/OS VERSIONS
Windows: 
macOS: 
Linux/KDE Plasma: 
(available in About System)
KDE Plasma Version: 
KDE Frameworks Version: 
Qt Version: 

ADDITIONAL INFORMATION