I have seen this difference on a couple of the Beast Mastery traits - I’m working on verifying the exact formula to make sure. The formula for Kill Command’s damage is pretty strange/unique compared to almost every other ability in the game. Right now I’m not really sure either simulator is doing this trait correctly.
Alright, I was able to verify the formula for Kill Command and the trait - we had the extra damage from the trait being multiplied too much, so we’ll re-rank it.