This issue I believe has been in the game since the mode has been released (1 year ago) and is still not fixed.
Having a few parties, I reorder them in tavern (including, but not necessary changing mercs in some of them, renaming, everything), everything works as intended.
Then you go back to the main mercenaries screen and the screen freezes. If you wait long enough it closes and goes to the main Hearthstone screen and you can do nothing until you restart the client.
Then you go back and see none of your changes were done after reordering, reordering itself is done. BUT all of the parties are now bugged if you want to change them instead of just use them somewhere.
This bug has been like that for 1 whole year.
1 whole year, fix when???
(PC, windows 10, running 24.4 version at the moment if it matters)
Are we in a beta version? Yes?