Since the update to add the waiting list GRSS has doubled my snapshots too.
I added a check to the GRSS to attempt to prevent it from taking the double snapshots. This is in the newest version, which was deployed a few days ago.
One of the things about it is that, for whatever reason, the game is triggering two events for each kill now instead of one, which is triggering the snapshot twice.
Try running the update and see if that fixes it. If not, let me know, and I'll continue trying to tweak it.
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It's all in the reflexes.