I am not sure this is intended behavior, but there is a different list of updates if I run:
sudo dnf update
for the records, comparing the list of updates with yum, it seems the first form got the list right, while the sudo form contains a just a subset of the available updates.
Hello, this is the expected behavior---each version works with different metadata. If one waits for the metadata to come in sync (after some time or by forcing them), the output will be the same.
*** Bug 1090117 has been marked as a duplicate of this bug. ***