10.13.6 install issue

App Store Update lists the update. I install the update. About this Mac shows that update has been installed. App Store Update still shows update as needing to be installed. What do I do to clear the App Store Update from listing 10.13.6 as needing to be installed since About this Mac says it has been installed? I have tried repeatedly to do the install in hopes that the App Store Update would no long list the update, but it is still listed.