A bug is causing the Windows 10 KB4494441 May 2019 Cumulative Update to be shown as being installed twice on some computers according to Microsoft and user reports. When users see the update listed twice, it is nothing to worry about as it is just a cosmetic error. […]

from https://www.bleepingcomputer.com/news/microsoft/windows-10-kb4494441-update-may-be-shown-as-installed-twice/