There was some problems with the mirrors a week ago that maybe it wasn’t resolved yet,maybe the update is indeed installed but your mirrors are outdated so the system thinks is not updated and it show the previous version.
Just out of curiosity, its weird of how the mirrors can notify of an update, but can’t provide an update. I have no idea how any of this works and its voodoo as far as I know, but from an intuitive point of view, it is confusing.