Have a read of this https://appletoolbox.com/2016/07/fix-corrupt-user-accounts-macos/#Reset_Home_Fol der_Permissions
It talks about resetting home folder permissions and acl’s (about third of the way down), but for Sierra and High Sierra this apparently is no longer possible (or necessary) because the OS does this for you when updating itself!
So, I would try downloading the latest Combo Update and reinstall manually to see if it does in fact do the required “repair” as Apple now maintain.
Download macOS High Sierra 10.13.3 Combo Update
Obviously, as always BackUp any important data first.