Are quests / Storyline shared between my characters in Diablo 3 (if within eligible level range)?

Question

This question is rather difficult to phrase.

I played a character to lvl 9, then left them alone. Then I played a different character to 15, advancing further in the quests and storyline.

Today I logged into my old lvl 9 character, and all the quests I completed on Character 2 showed as completed and my next quest was way up in lvl 15sville.

Are storyline quests shared across characters? There's no way to have a character separate from that (aside from "going back" on Character 1 and "starting" at an earlier quest in the line)?

Answer 1

No, they are not shared between characters. Either you played a multiplayer game in which you were jumped forward to a later quest, or it is just a bug. I've experienced this before where quests are marked as completed even when they shouldn't have been, and I've seen numerous other reports of it as well. I wouldn't worry about it, you can use Change Quest to back up to wherever you want to be.