I killed Azmodan on hell last night, before logging out, I went into my friends game to say hi ,he was on Act 2 - killign Maghda.

Anyhow, I logged out and went back in this morning and pressed "change quest" option and it stated that I was only up to Act 2....

The last quest of Act 2 actually..

If you look at my achievements, you will be able to tell that I have earned a Lord of The Sin (Hell) achievement and yet I am stuck in Act 2...

Any help please??