Guild Wars 2

Hello,
I and my sister have recently completed quests Dredging up the Past, Bad Blood, Containment and then we both had active quest Mightier than the Sword.
Then I left our town for 4 days (4th to 7th Sep), the quest bug happened during my absence.
When I returned, my sister had completely different quest active, but she did no progress towards personal story. When I opened her quest log, she had same quests history as me, but her current active quest was different (On Red Alert).
We play together, have same personal story, so this bug blocks us both.
Thanks in advance

Containment is bugged for me.

Experienced the following bug in Dredging up the Past:
First attempt: I discovered the first 2 artifacts and went on to the third indicated site. I investigated the site before I killed off the dredge around me, triggering the dredge chief + dialogue. “Killed” the chief and got the final cutscene, however the ‘leave instance’ button never appeared and the quest did not update (to go and talk to Gixx).
In the dredge cave was still the prison with two prisoners, whom I could greet, but they gave no storyline, but the random NPC answers and I could do nothing to free them. (so I left the instance by walking out of instance territory)

Second attempt: I first cleared the cave of dredge, when the cave was clear (but I had not looked for any artifacts) the ‘free the captives’ mission objective appeared and the captives ran past me (apparently freed already without me doing anything else but kill off the dredges which triggered and finished the objective apparently at the same time) with their ‘being freed’ dialogue. After that I did the investigation objectives and ended up with the same final cutscene as before – this time ending the mission correctly (with exit button + update go to Gixx)