So I rushed 7 chars to act 5 normal, and used one socket option, and now every character has the quest completed and no socketing option (at least not the other 6 that I haven't used). Is this a common bug here, or am I just seeing things?!
Never mind this. I believe I accidentally rushed some of my characters twice. Maybe that's why speaking with NPC while rushing seemed too weird for some of the characters lol, because I found one of them with the quest active, because he was the only one that wasn't rushed before. My bad!