Davide
It looks like the original EFI partition created by Windows was formatted when you installed Fedora. Window has a couple of tools on their boot ISO you can use to fix the EFI partition. If you are using Windows 10 you can download a iso from Microsoft Website or you can download from computer manufacturer if you are using a OEM image.
This guide seems to be a good guide for restoring a Windows UEFI directory using Windows bootable iso. You should backup you Fedora EFI directories before attempting to restore the windows EFI directory.
Microsoft documentation for the bcdboot command.
Take care