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#90
You are up to date, and there are additional updates available. That is not a contradiction. You are up to date with the latest security fixes. These are only issued on the 2nd Tuesday of the month (the 'B' release). The additional updates available are non-security fixes, a preview of those to be included next Patch Tuesday. That's why they are optional.
Windows 10 monthly security and quality updates overviewMicrosoft said: