grub has been updated it self - so I suspect it is an inconsistency.
It is advised to run grub-install and regenerate config to ensure all parts of grub is up-to-date and in sync.
As grub is now at 2.12, before restarting your system, it is advised to run grub-install to ensure all parts of grub is up-to-date. See our wiki for more details: GRUB/Restore the GRUB Bootloader - Manjaro