I did my updates meanwhile and System Overview still shows old information about the updates - you can see it at the timestamps. Checked for updates at 10:42 PM and ot shows still checked at 03:56 AM below, so it wasn't updated by clicking "Check for updates".
It is possible that the information is cached. Please try to open Tools & Settings > Server Management > System Updates and check the update status there once, then return to the Home page. Is the extra information gone?