During an update, grub was replaced with grub-fedora 2.03.62-f29-4
Is it a mistake, or is everything as it should be?
I doubt Manjaro update forced replace Grub. Check your Pacman logs and see what happened.
it says
ALPM] transaction started
[2021-03-11T19:07:53+0100] [ALPM] removed grub-customizer (5.1.0-2)
[2021-03-11T19:07:53+0100] [ALPM] warning: /etc/grub.d/40_custom saved as /etc/grub.d/40_custom.pacsave
[2021-03-11T19:07:53+0100] [ALPM] warning: /etc/default/grub saved as /etc/default/grub.pacsave
[2021-03-11T19:07:53+0100] [ALPM] warning: /boot/grub/grub.cfg saved as /boot/grub/grub.cfg.pacsave
[2021-03-11T19:07:53+0100] [ALPM] removed grub (2.04-21)
[2021-03-11T19:07:53+0100] [ALPM] installed grub-fedora (2.03.62.f29-4)
[2021-03-11T19:07:53+0100] [ALPM-SCRIPTLET] Copying /boot/grub/grub.cfg.pacsave to /boot/grub/grub.cfg
[2021-03-11T19:07:53+0100] [ALPM-SCRIPTLET] Generating grub.cfg.example config file...
[2021-03-11T19:07:53+0100] [ALPM-SCRIPTLET] This may fail on some machines running a custom kernel.
[2021-03-11T19:07:57+0100] [ALPM-SCRIPTLET] done.
Maybe?
You should always post the full text including the command you typed, not parts of it, including the contents of 40_custom according to your output [ALPM] warning: /etc/grub.d/40_custom saved as /etc/grub.d/40_custom.pacsave 
. Why did it need to create a new custom file? Have you (or a program) altered something there?
By what you 've posted one can only assume that you 've previously tried to remove a package related to grub-customizer or you have tinkered around with it or with other packages leading to this result.
40_custom is probably part of grub customizer and it created a pacsave on removal.
I guess the user replaced himself grub with grub-fedora, and it removed grub-customizer and grub. My guess.
What command lead to this? Check your bash history file then.
Why do we even have grub-fedora in our repo in the first place? It’s not pulled from Arch, someone in Manjaro is maintaining it.
That being said… grub-customizer causes more issues than help.
Yes I boot Clonezilla. I have now rolled back one day with Clonezilla and now everything is working as it should .Thanks for your help
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