I have started multiple characters even at one point deleting my favorite character so that there were no character left on the account to try and resolve this. It is not a character issue it is an account problem.
When I first played through, I took my time and by the time I got to Cathedral of Light (CoL) I was a lvl 53 sorcerer. As I started CoL and went back to Kyovashad to the CoL I was told to talk to Donan which I did, but instead of starting me on CoL he instead sent me to the stables and I started Act 4 without ever completing Act 3.
Once I realized I was in the wrong Act I restarted the game after a complete clean install of both battle net and D4. Upon restart I was no longer in Act 4, but now playing at the start of Act 5. So I took the unprecedented step of deleting the character and starting a new one.
This time I played aggressively doing only the necessary quests / dungeons to get to CoL as fast as possible. When I finished Act 2, my Journal showed Act 5 not Act 3. I did play through Act 5 to see if that would somehow reset the account, but it did not.
The game is unplayable for me due to this bug. I need someone to step up and actually help.