Description of problem: "grub2-mkconfig" command is not sorting kernel menu entries in proper order.
grub2-2.02-0.19.fc23 has been submitted as an update for Fedora 23. https://admin.fedoraproject.org/updates/grub2-2.02-0.19.fc23
Package grub2-2.02-0.19.fc23: * should fix your issue, * was pushed to the Fedora 23 testing repository, * should be available at your local mirror within two days. Update it with: # su -c 'yum update --enablerepo=updates-testing grub2-2.02-0.19.fc23' as soon as you are able to. Please go to the following url: https://admin.fedoraproject.org/updates/FEDORA-2015-12687/grub2-2.02-0.19.fc23 then log in and leave karma (feedback).
Package grub2-2.02-0.20.fc23: * should fix your issue, * was pushed to the Fedora 23 testing repository, * should be available at your local mirror within two days. Update it with: # su -c 'yum update --enablerepo=updates-testing grub2-2.02-0.20.fc23' as soon as you are able to. Please go to the following url: https://admin.fedoraproject.org/updates/FEDORA-2015-12687/grub2-2.02-0.20.fc23 then log in and leave karma (feedback).
Package grub2-2.02-0.21.fc23: * should fix your issue, * was pushed to the Fedora 23 testing repository, * should be available at your local mirror within two days. Update it with: # su -c 'yum update --enablerepo=updates-testing grub2-2.02-0.21.fc23' as soon as you are able to. Please go to the following url: https://admin.fedoraproject.org/updates/FEDORA-2015-12687/grub2-2.02-0.21.fc23 then log in and leave karma (feedback).
grub2-2.02-0.21.fc23 has been pushed to the Fedora 23 stable repository. If problems still persist, please make note of it in this bug report.