This is what Fedora grub builds as grub parameter to the linux grub command. It is without any of grub params configured in /etc/default/grub.
I have no idea what and how Fedora builds in grub entry, but it is not normal.
The best you should do, if you want to use Garuda grub to boot Fedora, is to exclude Fedora from Garuda auto-discovery grub entries and use a custom entry for Fedora.
Doing system administration blindly, following random web advice (without understanding, or really reading) can make your system(s) broken, unbootable etc.
It’s your system after all. 
Tip
‘GRUB_OS_PROBER_SKIP_LIST’
List of space-separated FS UUIDs of filesystems to be ignored from os-prober output. For efi chainloaders it’s @