Could you please check in efibootmgr if the Garuda entry should be put as first?
In general you should use Garuda’s grub, which should be able to detect the other OS’s (give it also a sudo update-grub after you fix the grub).
If necessary, you could reinstall it (I guess in /dev/nvme0n1p1, chrooting into /dev/nvme0n1p3) following this tutorial: