It was working correctly at first, but now displays some of the vanquished as victors.
The only one listed here who has killed me is Tankman2:
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I saw this when it first came out as well. I hadn't been killed at the time, so the list was the same as those I shot down.
I didn't post it because I felt it was minor, but I'm in agreement with the bug, and I think I have a screenshot if needed.