So before the new year I was able to move Story tickets into Epics by dragging and dropping them into box in the Backlog. Now when I attempt this I get an error "Epic can't be a parent issue of Story. To change this, adjust your issue type hierarchy settings." When I check my "issue type hierarchy" it is set up to allow Story tickets to be children of Epic. What happened, what changed, how can I move my existing tickets into the epic?