Among packages that are causing problems: adwaita_icon_theme, gcr, libhandy, wailand and all gstreamer packages. If you have a notch in case Show more details, you can see that these packages have same exact version. However they seem to have changed (different date or checksum after rebuild?) and SoftwareUpdater wants to upgrade them. Probably their package version wasn’t bumped so it ends up with the above message. Doing a pkgman full-sync leads to same problem.
Meanwhile, you can use pkgman update package1 package2 … in terminal for packages that needs to be updated. I.e. those that have a newer version.
As a side note, you shouldn’t use Flat decorator/ control look at the moment, to avoid these holes between borders and windows. The hole in repository window ( above + and - buttons) is present with all control look when you raise font size and should be fixed. I don’t know if there is a bug report for that already.