Betted deathmarks are always lost whether an invasion was a success or not.
Here I betted 2 marks, made 3 kills, collected 2 crests, died once. I lost 2 marks at the end, but got 1 from the chest.
https://www.bungie.net/7/en/Pgcr/16664964133
Here I betted 2 marks, made 3 kills, collected 3 crests, never died. I lost 2 marks at the end.
https://www.bungie.net/7/en/Pgcr/16665031975
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This keeps happening to me as well. And I get locked in the activity after completing successfully and don’t get taken back to spawn