I guess the output should have been
Fedora-Workstation-Live-osb-40-1.14.x86_64.iso: FAILED open or reads
Fedora-Workstation-Live-x86_64-40-1.14.iso: OK
sha256sum: WARNING: 17 lines are improperly formatted
sha256sum: WARNING: 1 listed file could not be read
You are checking two files, One is OK and the other one is missing, because you didn’t download that as well. However, you don’t need to download that file and everything is fine.
The 17 lines are the gpg check data, and you can ignora the WARNING as well.