Let's gathering some information:
Do post text output between </> code-tags: [code] paste text here [/code].
Boot with the live USB and post "Quick System Info" (found the the Menu ).
What I'm a bit unclear is this:
Because the MX18.3 installation would have cleared the content of /boot folder, I'm not clear where the fedora grub menu does come from.
Also there are a lot of 32bit efi-loader on the ESP. So the question is do you boot with 32bit or a 64bit UEFI system?
So incase it happens you boot with 32bit-UEFI, this would trigger to load BOOTIA32.EFI ,
which load -> /EFI/fedora/shimia32.efi and finally would load /EFI/fedora/grubia32.efi, the old fedora grub.
So some more question:
When you got the fedora grub menu, can you find out the UEFI-cpu version this way:
Press 'c' ( that the C for command line) and type
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echo $grub_cpu $grub_platform
When booted LiveUSB MX18.3 do open terminal again and chroot into MX18.3 with:
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sudo chroot-rescue-scan
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efibootmgr -v
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BootOrder: 0001,0002,0003,0004,0010
...
Boot0003* UEFI OS HD(2,GPT,622cbee9-38a3-4507-bbdd-c18b1e1ef7f6,0xc3800,0x64000)/File(\EFI\BOOT\BOOTX64.EFI)
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efibootmgr -o 3,2,1,4,10
with
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efibootmgr -v
Further I would consider to clear the ESP with unused folder like fedora folder or you might even find old grub folder ..
as the ESP has limited size, so in case you have other folders than MX.. , BOOT or Microsoft,
you should get rid of those other directories.
That's it for now ..