Levels that you can only use hero's

A couple months ago, I was stuck on these two levels and I just couldn’t finish them! Every thing in my code was fine so I couldn’t play for months until finally I changed my character to a hero (I have a subscription) and the levels worked but the bug is that it doesn’t tell you that you can’t use a ranger or a wizard. Normally it shows you that you can’t be a wizard or ranger on the level when you’re changing it on that level or if you are already a ranger or wizard it just changes you character altogether