I did a quick test. You're right, somehow the sub-tiers don't update on the Edit page. They do update on the profile page, though. Tested this with one of my OCs.
So, just set the correct Tier v2, the Class will be correct on the profile page, and I will look into the issue on the Edit page.
So, just set the correct Tier v2, the Class will be correct on the profile page, and I will look into the issue on the Edit page.