In my player stats screen, in the order of Serco/Itani/UIT, it says that I've killed 33/7/10, which equals 50 kills, yet it says that my total kills are 49.

Thats cuz the UIT kills only count as 0.9 per every kill. Basically cuz they're all just a bunch of capitalist dogs.

Gavan

was one of them during a duel?

seems they don't count towards the pk badge.

They do count, and either way they would still show up on your kill list.

Now that I think about it, this may be related to another problem I had a couple months back... I had a problem where an Itani kill didn't register in my kills, but when this got fixed... I think that I didn't notice that I got +1 to itani kill and not +1 to total until just now.