My guess is it intended due to if your in an arena map for example the round has ended or you lost and no one else can interfere until it's over. It should be that once all fell off the stage or something for this parkour map that you will all be teleported back once the level is over I assume if this is like a hardcore parkour map with death rules I guess. I don't know for sure, can you point out the map your playing on, I can only guess the situation based on what you have stated.
I'd say get someone to exit to a HUB or something or otherwise if you can get someone that's hosting to turn you back to gamemode adventure instead. Otherwise an Open to LAN to change gamemodes should also work, just log out once your done if you don't want that LAN opening to still be there for people to join.
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