Guild Wars 2

I defeated the first boss in Tier 1,and when I continued,I happened to join into one player’s gauntlet who was combating the first boss in Tier 2,we defeated it.Unfortunately,the system moved me into Tier 2,and I could only combat the bosses in Tier 2 with only one boss defeated in Tier 1.Now I am caught out by the third boss in Tier 2,and I can’t complete the achievement of Tier1.So can you help me handle this?

the choice of Tier 1 and Tier 2,and the progress of the Tier 2.

I have a similar problem. While I was fighting Masticus in tier 2 Salazan suddenly appeared so I had to fight both of them at the same time. I killed Salazan before Masticus and the match ended, apparently now I can’t challenge Masticus anymore since I never actually defeated him and just moved up in bosses.

Yep I had the exact same problem I skipped the end boss of tier 1 and all bosses except the pirate in tier 2.