1:00 Kill: 1022 0 36: <world>^7 killed b^4en^7machine^7 by MOD_SWARM
is what I get in my server log. Given that the examples you posted are players who have been playing for a long time, and only have a few hive kills, I reckon it's probably a special case, like a hive kill immediately followed by a specific other server message or something similar. That's my theory anyway, you'd have to ask dasprid (which leaves me wondering why I bothered posting, but it doesn't seem to have stopped me :p )
While we're on the subject, can anyone tell me what the prefix 1022 0 26 is for? Never been able to work it out.