https://www.techradar.com/news/windows-10-cumulative-update-causes-confusion-by-apparently-installing-itself-twice

Some Windows 10 users have encountered a problem with Microsoft’s latest round of cumulative updates for the OS, specifically with KB4494441, which is an important update (more on that later) for those running the October 2018 Update.

The issue here, as highlighted by folks on Reddit, is that KB4494441 is installed, and then the update is installed again by Windows 10. Update history then indicates that there are two KB4494441 updates installed, the second of which has a number two in brackets at the end of it – KB4494441 (2).