There seems to be a bug where when you have completed the invasion, gotten enough kills that is, and you are inside a Behemoth walker that you sometimes don't get taken back to spawn. I've seen this happen in both a double-cross and a regular invasion, you just don't get transported back to spawn to collect your loot. With a double-cross, you can just sit till the timer ends and that's that. But for a regular invasion, you keep showing up in the world. Dying again, either by the enemy team or by environmental death doesn't take you to spawn. You die until you run out of revives and then it tells you that you lost the round. I'd not seen this until I had unlocked the walker, which is why I think it is related. Going to try a few without in even equipped to see if it is the issue.