I see that the supporter and teacher badges were migrated, but I also had Enthusiast and Fanatic badges which I don't see now. Are badges re-assigned after migration, according the the data in the migrated site?
Yes, all badges and reputation scores have been recalculated as a result of the migration.
We were able to retroactively apply badge grants for Enthusiast and Fanatic. You should now see them on your profile.