Interesting.
I'm not convinced there is an upgrade path direct from 30 to 33 - best
practice usually suggests that you take all the intermediate steps -
30->31, 31->32, 32->33
I don't know if this accounts for the issue.
On the other hand, (and from what you say) this could be completely
cosmetic. You could just edit /etc/fedora-release to show 33.
I've just skipped from 31-33, and the upgrade performed properly, and
the release number changed to 33.
Just to check, you did install the upgraded fedora PGP key? If you didn't
then the packages would all be downloaded, but *not* installed.