Unable to update from 10.13.5 to 10.13.6

When updating from AppStore, the first boot goes normal, on the second reboot to the installer, it says Mac could not be updated because it will interfere with existing operating system. My data and the mac partition is then rolled back to 10.13.5.

Any help why this might be the case?

FWIW I made the mac installer on a Windows PC, could that have caused the problem?

submitted by /u/kvn95
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