I was using Valk that match and just double checked the season 12 kills tracker and it also says 4 kills. I recorded the game play and rewatched it and think I may have found the problem. One of the kills I got was from an enemy another squad had knocked but I finished that other squad first. There was no pop-up for the "Killed X player" but there was a plus one in the kill tracker in the top right and I guess the final kill count. I still have the recorded game play if you would like me to share it
No, that's perfect in terms of digging in. I know there are definitely some discrepancies here, so this is very helpful for sussing out where there are. Thank you very much.