Your killfeeds are always great. How did you manage to kill a Ravager with TacScan? I know you can to that to swarmers, and I assume it would work at extraction, but that looks like mid game.
It's possible to get stuff like that accidentally, as well as from reactor use.
Kills gotten by disruptor ammo ect aren't counted to the gun, the kill's counted towards the last attack that hit the target instead, similar to how sabotage works.
As a demonstration, take a TSol out on a solo with some disruptor ammo, and use nothing but his gun and marksman.
You'd expect the 25 kill medal and the 25 weapon kill medal to ping simultaneously, but in practice it won't, because some of those kills won't be credited to the weapon.
I discovered this when I repeatedly played "Special Op Reinforcements" for the blackwatch event and found I was always getting weapon kills medals slower than I should.