You have minimally three different GRUBs installed and I don't consider it far fetched that there's a fourth from a previous attempt at booting in BIOS rather than EFI mode.
]]>There are two FAT partitions, and efibootmgr shows that all but the Arch GRUB reside on nvme0n1p1 instead nvme0n1p6. If your mainboard supports this then this can be fine but just reads a bit weird. That said I'm not sure whether you have a remaining issue? If you boot the GRUB entry in your UEFI loader you can boot that install, yes? The other "GRUB" in the title and post will be a remnant of whatever experiments you had earlier, maybe do some general spring cleaning and get rid of GRUBs/loader entries you are not using anymore.
]]>Other than that you appear to have created a secondary ESP. If your mainboard supports this isn't guaranteed, in any case just from this you need to configure your UEFI to boot the entry nr 5 here, the one that's just called GRUB.
]]>lsblk -f
efibootmgr -uv
Moving to the Archinstall section.
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