In Dalaran Heist and Tombs of Terror, no matter which deck I choose with a character, it always give me the first one (the one unlocked by default). I tried in heroic, regular and with different class, every time I choose a deck different than the first one, it still give me the first one.
video with what is happening on my client
https://youtu.be/4MZpfVqQYJo
Yes, experiencing the same thing.
Can confirm, this is happening to me as well, outside of the actual match it will show you the deck you picked but once you get in to the match the first 10 get replaced with the default deck.
Same here, can confirm
Iāve tried all the charactersā decks, and Iāve cleared them all. And Iāve reinstalled the game. Plus, Iāve tried it on my mobile. It doesnāt all work.
Also having this bug. Iāve just started trying to clear ToT with all decks, treasures and hero powers and keep getting swapped back to the first deckā¦
There also appears to be a bug with the completion marks now?
I decided to just complete the runs with the first deck only (as thatās all I can play). Completed Wing 3 with Brann and the egg using the first deck. Completion mark shows for the egg, but not for the dino deck.
I also have Brann showing no completion marks at all for Wing 3 with any treasures, despite having completed that wing. Iām not sure if itās related (i.e. maybe somehow I removed the treasure from my deck or something? That one was a while ago)
Same for me. Very frustrating on my hunt to clear every chapter with all heros on heroic. Please fix it 
Extremely infuriating, I paid for multiple decks, please fix this asap.
They know the problem.
Wait a little 
They knew it, but itās already been two weeks. Now the patience is running out.
2 weeks is almost nothing.
Itās true that it seems like a long time when youāre waiting for something, but they have a lot of problems to resolve (there are also a lot of messages in the forum to read).
I think that a period of 1 month to wait is reasonableā¦
Then it becomes very painful.
(I wait too for that but I do something else in game.)
Jak tylko Bugzard skoÅczy ujawniaÄ wszystkie karty z drugiego dlc z roku pegaza udostÄpni drugÄ aktualizacje przed premierÄ byÄ może naprawi ten glitch bo już mnie zaczyna dziaÅaÄ na nerwy
Tak, może.
Mamy nadziejÄ
Yes maybe.
We hope.
This type is the scariest. He get angry the most after the day He told before.
Blizzard, the small indie billion dollar company that is slower on fixing issues than a grandma
Also happening to me. I now remember why i stopped playing all blizzard games for the past 5 yearsā¦
Still bugged. Very annoying.
Please fix it quickly. I canāt breathe.
Same issue here. Coming back to hearthstone after 2 years and have experienced a litany of bugs. Before microsoft bought blizzard, this was never an issue. QA at least seems to be managed poorly now. No offense to the hard-working engineers.