Hello ,
I am leveling a char , I always did hosting a Private game, alone.
Yesterday, for the first time , I hosted a Public Game , and another player popped up in my char selection char screen.
I was playing Act 2 , the Arena event. After I logged in , i opened the map :
ALL the Teleport Gates were unlocked , the yellow star of the quest in progress was on LAST BOSS of the Act, not anymore on MY progress.
I quited and played again this morning , switching back to Private Game.
unfortunately Map,Quests , Gates , are still the same .
I basically lost part of the chain story till BOSS 2 , and I would like to play it back .
How can i recover it?

Thanks in advance