Hmm, that's indeed weird. Confirm that the folders and file naming fits Kodi's convention. I'd also advice the use of a Media Manager and during import, ask Kodi to scrape from local info instead. Of course, only do this after setting up the various media folders properly.
Sure.. You can force Kodi to check for updates or go into the official Quasar repo and install the latest Quasar Burst addon. Also, if you still have the previous providers or the unofficial Quasar repo installed? Uninstall all of them, especially the unofficial repo, as it disturbs the Quasar addon from seeking update properly..